RB Header
12-07-01, 05:58 PM
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RB Header
I have a 1988 Convertible, im about to do some mods seeing how im stock right now. The first thing is exhaust i can get a rb header from a budy who crashed for cheap, unused. For this i belive i need a rb presilencer??? I also heard that a downpipe is better than a header and is much quiter. Will this make good performance gains? Input would be great!!
thanks
Craig
thanks
Craig
12-08-01, 05:22 PM
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Header is better if you plan on doing more mods in the future.
It is noisy unless you use the presilencer. I used a cat instead on mine, but I wanted to stay kinda "green." It's a little noisier than the presilencer, but still works ok. I have Dynomax cat-back for rear exhaust.
Ren
It is noisy unless you use the presilencer. I used a cat instead on mine, but I wanted to stay kinda "green." It's a little noisier than the presilencer, but still works ok. I have Dynomax cat-back for rear exhaust.
Ren
12-08-01, 09:52 PM
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is the presilencer nessesary even with good mufflers. I have no emissions laws so cats dont matter i just dont want to be to noisy! I have dynomax mufflers right now will the increased air flow ruin them? also do i need the presilencer to prervent back fireing and so that i have back pressure, maybe without, it will be to free flowing.
craig
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12-08-01, 10:27 PM
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I would highly recommend the pre silencer, without it you will become the scourge of your neighborhood, you will never be able to sneak in late at night anymore, you will become very popular with your local police force, and you will loose your hearing. Well maybe not your hearing.
hanman
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12-09-01, 03:09 AM
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im new to rx-7's but heres my take on this:
if you plan on keeping it N/A or maybe supercharging it, then get the headers. if you plan on getting a turbo, then get the downpipe. with the headers you dont have the ability to re-route exhaust to the turbo as it is just putting 2 pipes that route the exhaust strait out the back. this doesnt matter for supercharging since that is belt driven, and not exhaust driven. if you get headers now and upgrade to a turbo later your gonna need to replace the headers with a downpipe or something to get exhaust re-routed.
all depends on what your future plans are....
i personally like telling guys they got beat by an N/A..... especially if they got a turbo or somthing.....
if you plan on keeping it N/A or maybe supercharging it, then get the headers. if you plan on getting a turbo, then get the downpipe. with the headers you dont have the ability to re-route exhaust to the turbo as it is just putting 2 pipes that route the exhaust strait out the back. this doesnt matter for supercharging since that is belt driven, and not exhaust driven. if you get headers now and upgrade to a turbo later your gonna need to replace the headers with a downpipe or something to get exhaust re-routed.
all depends on what your future plans are....
i personally like telling guys they got beat by an N/A..... especially if they got a turbo or somthing.....
12-09-01, 08:59 PM
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Thanks for the input i think i will go with the header and presilencer ..... and later i will get new mufflers....or if it souns bad right away but i want to try to hold off.
12-09-01, 09:39 PM
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my suggestion is dont get teh header. Header is VERY loud. I have no expericne iwth the presilencer, but my car has the RB header, then I had a pipe made to conncet to a Apexi N1. it is VERY loud, no EXTREMLY loud. if you are worried about noise do NOT get a header. A header only offers minimal gain over a race pipe. the race piple bolts up to the stock manifod and then connects to the cat back. and it is fairly cheap from rx7.com. I would suggest getting the race peipe if i were you.
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12-09-01, 10:22 PM
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Well I would go with the header/presilencer combo definitely. If you get the RB catback it shouldn't be too loud at all. If you want it to be quiet then u might wanna sell you rx7 
They just are not quiet. But the downpipe does not give as good as gains as the header will.
They just are not quiet. But the downpipe does not give as good as gains as the header will.
12-09-01, 10:52 PM
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Im not that worried about being loud, i just dont wanna sound like a piped out civic. Not that is that bad....well maybe. Im sure if i have good mufflers it will sound decent as it is. Also i will have no cats or anything because there is no laws against it, making it louder aswell.From what i have heard though the down pipe is supposed to give more horse power gains is this true????
12-09-01, 10:57 PM
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ok, im gonna try to staiten this out. na cars do not have "downpipes". Downpipes are for turbo cars. na's have either a header, or a racepipe. the Header takes the place of the stock exahust manifold. the racepipe bolts onto the stock manifold and attaches to the cat back. the header gives MORE power than a race pipe, but not a whole lot more. since your not worried about your car being loud then go for the header. but, the sound will depend on if you have a good cat back or not. with the apex n1 on my car it sounds absolutly awesome!! but very loud
12-10-01, 05:34 AM
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Originally posted by Mazda2ndgen
ok, im gonna try to staiten this out. na cars do not have "downpipes". Downpipes are for turbo cars. na's have either a header, or a racepipe. the Header takes the place of the stock exahust manifold. the racepipe bolts onto the stock manifold and attaches to the cat back. the header gives MORE power than a race pipe, but not a whole lot more. since your not worried about your car being loud then go for the header. but, the sound will depend on if you have a good cat back or not. with the apex n1 on my car it sounds absolutly awesome!! but very loud
ok, im gonna try to staiten this out. na cars do not have "downpipes". Downpipes are for turbo cars. na's have either a header, or a racepipe. the Header takes the place of the stock exahust manifold. the racepipe bolts onto the stock manifold and attaches to the cat back. the header gives MORE power than a race pipe, but not a whole lot more. since your not worried about your car being loud then go for the header. but, the sound will depend on if you have a good cat back or not. with the apex n1 on my car it sounds absolutly awesome!! but very loud
12-10-01, 06:52 PM
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Originally posted by Ryde _Or_Die
Actually NA cars do have downpipes. I think ever car has a stock downpipe. What else would you call the pipe that comes down from the exhaust manifold? They actually do sell an aftermarket downpipe for NAs that someone on here dynoed as giving 17 rwhp with the use of the presilencer. The header/presilencer setup should give you more of a gain though, by at least a little.
Actually NA cars do have downpipes. I think ever car has a stock downpipe. What else would you call the pipe that comes down from the exhaust manifold? They actually do sell an aftermarket downpipe for NAs that someone on here dynoed as giving 17 rwhp with the use of the presilencer. The header/presilencer setup should give you more of a gain though, by at least a little.
engine, then stock manifold, then the 2 precats then the main cat then the cat back.
there is no pipe that comes off the stock manifold, the cats bolt up directly to the stock manifold.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts. there is a header and presilencer combo. a pipe that bolts up to the stock manifold and replaces the cats is called a race pipe. it goes fromt eh stock manifold to the catback. and there is absolutly NO NEED for a presilencer on such a set up. the car is not loud at all with a race pipe. go ahead, try it, gut your cats, your car will be all of 2db louder. you will hardly be able to notice it. a race pipe just replaces the cats, wich by gutting the cats you ahve esectialy the same thing excpet it doesnt flow as well b/c of the exhaust takes the shape of hte gutted cat. you will need a presilencer with a header to bolt upp to the catback, unless yuou get a pipe made, like me
, to make the header and catbck match up. and if you dont get a presilcner with a header your car will be very loud, like me . downpipes are only on turbo cars.
12-10-01, 08:53 PM
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Originally posted by Mazda2ndgen
Actually na cars do NOT have downpipes. there is no pipe htat comes off the stock manifold. this is how the set up goes:
engine, then stock manifold, then the 2 precats then the main cat then the cat back.
there is no pipe that comes off the stock manifold, the cats bolt up directly to the stock manifold.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts. there is a header and presilencer combo. a pipe that bolts up to the stock manifold and replaces the cats is called a race pipe. it goes fromt eh stock manifold to the catback. and there is absolutly NO NEED for a presilencer on such a set up. the car is not loud at all with a race pipe. go ahead, try it, gut your cats, your car will be all of 2db louder. you will hardly be able to notice it. a race pipe just replaces the cats, wich by gutting the cats you ahve esectialy the same thing excpet it doesnt flow as well b/c of the exhaust takes the shape of hte gutted cat. you will need a presilencer with a header to bolt upp to the catback, unless yuou get a pipe made, like me, to make the header and catbck match up. and if you dont get a presilcner with a header your car will be very loud, like me .
downpipes are only on turbo cars.
Actually na cars do NOT have downpipes. there is no pipe htat comes off the stock manifold. this is how the set up goes:
engine, then stock manifold, then the 2 precats then the main cat then the cat back.
there is no pipe that comes off the stock manifold, the cats bolt up directly to the stock manifold.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts. there is a header and presilencer combo. a pipe that bolts up to the stock manifold and replaces the cats is called a race pipe. it goes fromt eh stock manifold to the catback. and there is absolutly NO NEED for a presilencer on such a set up. the car is not loud at all with a race pipe. go ahead, try it, gut your cats, your car will be all of 2db louder. you will hardly be able to notice it. a race pipe just replaces the cats, wich by gutting the cats you ahve esectialy the same thing excpet it doesnt flow as well b/c of the exhaust takes the shape of hte gutted cat. you will need a presilencer with a header to bolt upp to the catback, unless yuou get a pipe made, like me
, to make the header and catbck match up. and if you dont get a presilcner with a header your car will be very loud, like me . downpipes are only on turbo cars.
http://www.racingbeat.com/FRmazda2.htm
Go to exhaust components & to the "downpipe 86-91" and read. It states that it fits non-turbo cars, both automatic and manual. Sorry to be the one to tell you. And what about cars that don't have precats? The pipe from the exhaust manifold would be called what exactly?
12-10-01, 09:21 PM
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Originally posted by Ryde _Or_Die
Ok, well the "precats" don't qualify as being a pipe?? I believe so. And if you replace those with a pipe it would be a downpipe. Here try this link:
http://www.racingbeat.com/FRmazda2.htm
Go to exhaust components & to the "downpipe 86-91" and read. It states that it fits non-turbo cars, both automatic and manual. Sorry to be the one to tell you. And what about cars that don't have precats? The pipe from the exhaust manifold would be called what exactly?
Ok, well the "precats" don't qualify as being a pipe?? I believe so. And if you replace those with a pipe it would be a downpipe. Here try this link:
http://www.racingbeat.com/FRmazda2.htm
Go to exhaust components & to the "downpipe 86-91" and read. It states that it fits non-turbo cars, both automatic and manual. Sorry to be the one to tell you. And what about cars that don't have precats? The pipe from the exhaust manifold would be called what exactly?
racing beat calls it a down pipe, rx7.com calls it a race pipe, call it whatever you want. but you are correct in that a racepipe (downpipe) with presilencer product does exist, i had not seen taht on rb website until then.
at any rate, anyone is an absotlte idiot for buying that. you dont need the presilencer for anyreason b/c your car will not be hardly any louder in the first place, rb is just making money of stupid na owners who think they can make a slow car fast. which the more power to em! thats how bussness make money, off of stupid people, just look at all the ricers!
my conclusion on this topic. dont buy any performance product for an na car that cant be switched to a turbo rx7 b/c its worthless. you will never see 13s with out a big shot of n02. and just wait and see how long the motor will last then.
12-10-01, 09:53 PM
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ok, this is very simple. NAs can be fast (maybe not 13second, but still just an exhaust system will give 20-25hp, so why not?) and they don't have a downpipe like what a turbo has(call the cats whatever you want to call them)
go to RX7.com and look at the race pipe with presilencer. Use this with your Dynomax catback, and it will sound deeeeep and loud and very good. I just got the straight pipe with presilencer for $150 with shipping from them and am going to buy a dynomax dual exhaust locally. I have heard this system being used and it sounds sooo nice. If you want to be able to hear anything (including the cops sirens), then DO NOT get a header! They are incredibly loud, and don't offer very much power over stock. I don't care what anyone says, the stock exhaust manifold is quieter than the header.
I highly recommend getting the straight pipe with presilencer and a dynomax catback because it sounds so nice! I currently have a straight pipe in place of my cats (just stainless steel, no silencers) and am using stock exhaust manifold and stock catback. The power gain when I went to that was quite a bit over stock, but the extra exhaust flow is making holes in the stock catback, so I'm putting in a proper exhaust system.
just my thoughts,
Kris
'91 'vert
'89 TII
go to RX7.com and look at the race pipe with presilencer. Use this with your Dynomax catback, and it will sound deeeeep and loud and very good. I just got the straight pipe with presilencer for $150 with shipping from them and am going to buy a dynomax dual exhaust locally. I have heard this system being used and it sounds sooo nice. If you want to be able to hear anything (including the cops sirens), then DO NOT get a header! They are incredibly loud, and don't offer very much power over stock. I don't care what anyone says, the stock exhaust manifold is quieter than the header.
I highly recommend getting the straight pipe with presilencer and a dynomax catback because it sounds so nice! I currently have a straight pipe in place of my cats (just stainless steel, no silencers) and am using stock exhaust manifold and stock catback. The power gain when I went to that was quite a bit over stock, but the extra exhaust flow is making holes in the stock catback, so I'm putting in a proper exhaust system.
just my thoughts,
Kris
'91 'vert
'89 TII
12-11-01, 10:41 AM
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Hey I personally think you can make NAs fast. I mean there are people that are in the low 14s. Now do you guys think stock 3rd gens are fast, because I sure do. The R1s run what, 13.9 stock with a perfect run & professional driver so if these non-pros can get low 14s I bet professionals can get lower than that in the modded NAs.
12-11-01, 11:08 AM
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heres the deal as far as sound goes. i bought the car(90 gxl) w no cats and 2 cherry bombs. the exhaust sounded a little beefier than the other rx-7's in town, but not really any louder. btw there is a presilencer on the car as well.
no just about a month ago i added headers to the car. so here is the car now:
engine, headers, presilencer, cherry bombs.
now as iv heard, a car with a strait exhaust(headers and then strait out the back) is super damn loud. this includes no cats and no silencer.
iv never heard one but ill take the word of the few people iv heard talk about it. now my car aint that loud, so i can only assume its the presilencer helping the sound level out. so i personally think a presilencer is a good idea.
no just about a month ago i added headers to the car. so here is the car now:
engine, headers, presilencer, cherry bombs.
now as iv heard, a car with a strait exhaust(headers and then strait out the back) is super damn loud. this includes no cats and no silencer.
iv never heard one but ill take the word of the few people iv heard talk about it. now my car aint that loud, so i can only assume its the presilencer helping the sound level out. so i personally think a presilencer is a good idea.
12-11-01, 12:01 PM
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Originally posted by Mazda2ndgen
Actually na cars do NOT have downpipes. there is no pipe htat comes off the stock manifold. this is how the set up goes:
engine, then stock manifold, then the 2 precats then the main cat then the cat back.
there is no pipe that comes off the stock manifold, the cats bolt up directly to the stock manifold.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts. there is a header and presilencer combo. a pipe that bolts up to the stock manifold and replaces the cats is called a race pipe. it goes fromt eh stock manifold to the catback. and there is absolutly NO NEED for a presilencer on such a set up. the car is not loud at all with a race pipe. go ahead, try it, gut your cats, your car will be all of 2db louder. you will hardly be able to notice it. a race pipe just replaces the cats, wich by gutting the cats you ahve esectialy the same thing excpet it doesnt flow as well b/c of the exhaust takes the shape of hte gutted cat. you will need a presilencer with a header to bolt upp to the catback, unless yuou get a pipe made, like me, to make the header and catbck match up. and if you dont get a presilcner with a header your car will be very loud, like me .
downpipes are only on turbo cars.
Actually na cars do NOT have downpipes. there is no pipe htat comes off the stock manifold. this is how the set up goes:
engine, then stock manifold, then the 2 precats then the main cat then the cat back.
there is no pipe that comes off the stock manifold, the cats bolt up directly to the stock manifold.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts. there is a header and presilencer combo. a pipe that bolts up to the stock manifold and replaces the cats is called a race pipe. it goes fromt eh stock manifold to the catback. and there is absolutly NO NEED for a presilencer on such a set up. the car is not loud at all with a race pipe. go ahead, try it, gut your cats, your car will be all of 2db louder. you will hardly be able to notice it. a race pipe just replaces the cats, wich by gutting the cats you ahve esectialy the same thing excpet it doesnt flow as well b/c of the exhaust takes the shape of hte gutted cat. you will need a presilencer with a header to bolt upp to the catback, unless yuou get a pipe made, like me
, to make the header and catbck match up. and if you dont get a presilcner with a header your car will be very loud, like me . downpipes are only on turbo cars.
12-11-01, 01:16 PM
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Originally posted by SpeedRacer
You are wrong, NA's can have downpipes. The two precats are pretty much a downpipe, and if replaced with a pipe of the same size then you would have a downpipe just like a Turbo car. The racepipe from from rx7.com is a downpipe plus straightpipe to the y-pipe, and it includes a presilencer.
You are wrong, NA's can have downpipes. The two precats are pretty much a downpipe, and if replaced with a pipe of the same size then you would have a downpipe just like a Turbo car. The racepipe from from rx7.com is a downpipe plus straightpipe to the y-pipe, and it includes a presilencer.
12-11-01, 02:37 PM
#21
Originally posted by Mazda2ndgen
no the precats do not count as a down pipe, they count as what they are, they are catalicic converters...
racing beat calls it a down pipe, rx7.com calls it a race pipe, call it whatever you want. but you are correct in that a racepipe (downpipe) with presilencer product does exist, i had not seen taht on rb website until then.
at any rate, anyone is an absotlte idiot for buying that. you dont need the presilencer for anyreason b/c your car will not be hardly any louder in the first place, rb is just making money of stupid na owners who think they can make a slow car fast. which the more power to em! thats how bussness make money, off of stupid people, just look at all the ricers!
my conclusion on this topic. dont buy any performance product for an na car that cant be switched to a turbo rx7 b/c its worthless. you will never see 13s with out a big shot of n02. and just wait and see how long the motor will last then.
no the precats do not count as a down pipe, they count as what they are, they are catalicic converters...
racing beat calls it a down pipe, rx7.com calls it a race pipe, call it whatever you want. but you are correct in that a racepipe (downpipe) with presilencer product does exist, i had not seen taht on rb website until then.
at any rate, anyone is an absotlte idiot for buying that. you dont need the presilencer for anyreason b/c your car will not be hardly any louder in the first place, rb is just making money of stupid na owners who think they can make a slow car fast. which the more power to em! thats how bussness make money, off of stupid people, just look at all the ricers!
my conclusion on this topic. dont buy any performance product for an na car that cant be switched to a turbo rx7 b/c its worthless. you will never see 13s with out a big shot of n02. and just wait and see how long the motor will last then.
Considering people can get around 50hp from N/As and stay N/A thats not too bad. N/As do pretty good for what they have. Not like Turbo II's are SOOOOOOOOOOO much faster, they're faster but not that much, only reason they can get so fast is turbos are easier to get hp/$$.
12-11-01, 04:00 PM
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Real quick. No arguing needed here. If you get the Racing beat front pipe (downpipe, cat replacement pipe, race pipe), you have to also get the presilencer, or have a custom pipe made to replace the main catalytic converter. I ordered the front pipe thinking I was going to get rid of those two pre-cats, and ended up having to get a pipe made for the middle. The bonez race pipe will bolt right up from rx7.com. Now, i also have a custom cat back to single muffler (off brand greddy dunk type) that I had to put a baffle in because it is too loud. My opinion, is buy the header from your friend, then buy the presilencer, or get a good flow through muffler for the middle pipe. But I agree with most here. The header is loud with an open rear section. Just my $.02.....
12-11-01, 10:02 PM
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OK, listen up poeple. I admitted i was wrong, I did not know that RB made such a product that replaced the precats and then had a presilencer... the only one i nkew about was the one from rx7.com.
as for you poeple that think you can have a fast na... what are you guyss smokin b/c i want some!! if you think 14s are fast you are wrong. do you have any idea how many cars run 14s bone stock? and a na wont see 14s with out a lot of mods.
as for the cars here that are running "low 14s". post your time slip. I have not seen one yet. there are several people that "should be" runnning low 14s. mazdaspeed7 should be running low 14s, but untill he takes it to the track it doesnt mean a thing. as far as i know, i have the fastest na 2ndgen with a stock motor on this board taht isnt spraying. if someone is faster please speak up. take it from someone who has modded an na almost completly, it will never be fast. and 14s is not fast. and yes T2s are MUCH faster than na's, and yes thats b/c they have a turbo! if i had spent the exact same amount of money on a t2 that has been put into my car the T2 would probably be in the 12s right now. And i have gotten the best deals on all my stuff, and done all the work my self. if you are happy with a loud car that can only pull 14s and get beat by hondas then knock yourself out, go ahead and mod your na car to oblivion. if you realy want to go fast, then save up and get a t2, or swap the motor. thats all there is to it
as for you poeple that think you can have a fast na... what are you guyss smokin b/c i want some!! if you think 14s are fast you are wrong. do you have any idea how many cars run 14s bone stock? and a na wont see 14s with out a lot of mods.
as for the cars here that are running "low 14s". post your time slip. I have not seen one yet. there are several people that "should be" runnning low 14s. mazdaspeed7 should be running low 14s, but untill he takes it to the track it doesnt mean a thing. as far as i know, i have the fastest na 2ndgen with a stock motor on this board taht isnt spraying. if someone is faster please speak up. take it from someone who has modded an na almost completly, it will never be fast. and 14s is not fast. and yes T2s are MUCH faster than na's, and yes thats b/c they have a turbo! if i had spent the exact same amount of money on a t2 that has been put into my car the T2 would probably be in the 12s right now. And i have gotten the best deals on all my stuff, and done all the work my self. if you are happy with a loud car that can only pull 14s and get beat by hondas then knock yourself out, go ahead and mod your na car to oblivion. if you realy want to go fast, then save up and get a t2, or swap the motor. thats all there is to it
12-22-01, 08:28 AM
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Originally posted by Mazda2ndgen
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts.
an no, NO one has a "downpipe" with presilnecer combo, no such thing exitsts.
Dave
12-22-01, 04:57 PM
#25
this is my point of view i guess:
ive got an 88 drop top also. im running pacesetter headers down to a catco hi flow cat (with pressure line for 6pt), back to an apexi n1. the sound is friggin sweet as hell. its not toooo loud, but it is noisy. i can sneak into my house late at night by just coasting....
now, when i swap in my race pipe for my cat, thats when it gets rowdy. i do this and wire open my 6ports. that makes a straight throught 2.5" to the n1 with no silencer. it is loud and proud. the cops dont bother me tho. i like the sound of it.. its crazy and pretty loud on the freeway. hondas back off fo sho.. OH yeah and you get to shoot flames.. so thats a plus..
scott
ive got an 88 drop top also. im running pacesetter headers down to a catco hi flow cat (with pressure line for 6pt), back to an apexi n1. the sound is friggin sweet as hell. its not toooo loud, but it is noisy. i can sneak into my house late at night by just coasting....
now, when i swap in my race pipe for my cat, thats when it gets rowdy. i do this and wire open my 6ports. that makes a straight throught 2.5" to the n1 with no silencer. it is loud and proud. the cops dont bother me tho. i like the sound of it.. its crazy and pretty loud on the freeway. hondas back off fo sho.. OH yeah and you get to shoot flames.. so thats a plus..
scott
