2nd Gen Exhaust Questions
#1
Junior Member
Thread Starter
Join Date: Jan 2015
Location: Arizona
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
2nd Gen Exhaust Questions
Hey all, I'm driving an 88 GXL N/A with no mods and I'm looking into doing the exhaust. Now I'm pretty much an idiot when it comes to a lot of car stuff so I've been trying to do a lot of research when it comes to doing this. I'll more than likely have a muffler shop do the work but I want to know exactly what I should be looking for. What I've found so far is that if I replace both the cat and the catback systems with high flow systems that I'll get a horsepower boost but when I looked at the schematics I found that there are two pre-converters before the actual converter. If I replaced the cat with a larger size inlet and outlet what happens to these preconverters, do I just have them tossed or do I have to replace them with something similar? Also if there is another thread out there that explain this please link it I couldn't find anything by searching that answered this
#2
jackie chan > chuck norri
iTrader: (2)
Hey all, I'm driving an 88 GXL N/A with no mods and I'm looking into doing the exhaust. Now I'm pretty much an idiot when it comes to a lot of car stuff so I've been trying to do a lot of research when it comes to doing this. I'll more than likely have a muffler shop do the work but I want to know exactly what I should be looking for. What I've found so far is that if I replace both the cat and the catback systems with high flow systems that I'll get a horsepower boost but when I looked at the schematics I found that there are two pre-converters before the actual converter. If I replaced the cat with a larger size inlet and outlet what happens to these preconverters, do I just have them tossed or do I have to replace them with something similar? Also if there is another thread out there that explain this please link it I couldn't find anything by searching that answered this
#3
Junior Member
Thread Starter
Join Date: Jan 2015
Location: Arizona
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
I live in Arizona so I still have to go through emissions and that kind of stuff so I do need a cat I just wasn't sure if the pre cats were still important. If not I'll just have them tossed.
#4
Full Member
Join Date: Apr 2015
Location: south carolina
Posts: 85
Likes: 0
Received 0 Likes
on
0 Posts
i would just buy a catback exhaust, not hard to pull it off and put a new exhaust, on my turbo ii i have a 3in downpipe, racing beat highflow cat, and its just open pipe all the way to the back until it hits the exhaust tips
#5
Junior Member
Thread Starter
Join Date: Jan 2015
Location: Arizona
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
I guess that leads to another question I have. If I just get the cat back do I need to get it in a size that matches the original or can I get a larger piping size?
#6
Full Member
iTrader: (1)
How does that make for the exhaust sound? I've been looking at down pipes for my turbo since it leaks but I can't really make a decision,I'm trying to keep a clean sound I'm one who honestly isn't a huge fan of the extremely loud brap, but hope to still improve the exhaust flow for some hp,I was thinking the best option would be like what you did,a name brand dp,then I could go to my local exhaust place and have a Midpipe,or possible raving beats pre silencer. it already has decent y pipes installed so i planned on keeping those.
Trending Topics
#8
Tear you apart
iTrader: (10)
Hey all, I'm driving an 88 GXL N/A with no mods and I'm looking into doing the exhaust. Now I'm pretty much an idiot when it comes to a lot of car stuff so I've been trying to do a lot of research when it comes to doing this. I'll more than likely have a muffler shop do the work but I want to know exactly what I should be looking for. What I've found so far is that if I replace both the cat and the catback systems with high flow systems that I'll get a horsepower boost but when I looked at the schematics I found that there are two pre-converters before the actual converter. If I replaced the cat with a larger size inlet and outlet what happens to these preconverters, do I just have them tossed or do I have to replace them with something similar? Also if there is another thread out there that explain this please link it I couldn't find anything by searching that answered this
RX7.COM | 1986-1991 Rx7 Exhaust (330)7-ROTARY
Or the Racing Beat Header with the Superflo cat (another they offer).
For a catback I highly recommend Racing Beat.
Power Pulse RX-7 Exhaust System for 86-92 RX-7 - Racing Beat
#10
Rotary Enthusiast
iTrader: (1)
Join Date: Nov 2012
Location: bloomington, mn
Posts: 1,100
Likes: 0
Received 0 Likes
on
0 Posts
jesus **** I need to just do a ride along video of my setup. Cheap, plenty of flow for a DD, and enough for a track day on a stock ECU.
RB Collected Header to Modified Cat to retain 5/6th ports NA, back to a OE NA y-pipe, to Bosal OE replacement Mufflers. Cheap as ****, sounds great, and it sure as hell picks up better then stock ever did.
All into this for under $300 new parts. I paid $150 used
RB Collected Header to Modified Cat to retain 5/6th ports NA, back to a OE NA y-pipe, to Bosal OE replacement Mufflers. Cheap as ****, sounds great, and it sure as hell picks up better then stock ever did.
All into this for under $300 new parts. I paid $150 used
#11
Junior Member
Thread Starter
Join Date: Jan 2015
Location: Arizona
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Awesome yeah this is what I was wondering about. I have some ideas about what parts I already want but this makes the decision much easier. I just wanted to make sure the pre converters needed to stay or go. Thanks for the help everyone.
#12
Full Member
Join Date: Apr 2015
Location: south carolina
Posts: 85
Likes: 0
Received 0 Likes
on
0 Posts
How does that make for the exhaust sound? I've been looking at down pipes for my turbo since it leaks but I can't really make a decision,I'm trying to keep a clean sound I'm one who honestly isn't a huge fan of the extremely loud brap, but hope to still improve the exhaust flow for some hp,I was thinking the best option would be like what you did,a name brand dp,then I could go to my local exhaust place and have a Midpipe,or possible raving beats pre silencer. it already has decent y pipes installed so i planned on keeping those.
like i said its pretty loud when i get on it and quiet when i am just cruising along
#13
Rotary Freak
iTrader: (16)
jesus **** I need to just do a ride along video of my setup. Cheap, plenty of flow for a DD, and enough for a track day on a stock ECU.
RB Collected Header to Modified Cat to retain 5/6th ports NA, back to a OE NA y-pipe, to Bosal OE replacement Mufflers. Cheap as ****, sounds great, and it sure as hell picks up better then stock ever did.
All into this for under $300 new parts. I paid $150 used
RB Collected Header to Modified Cat to retain 5/6th ports NA, back to a OE NA y-pipe, to Bosal OE replacement Mufflers. Cheap as ****, sounds great, and it sure as hell picks up better then stock ever did.
All into this for under $300 new parts. I paid $150 used
#15
Full Member
iTrader: (1)
If you want it to be obnoxiously loud, spit fire and give a decent HP gain you could cut out all the junk from the exhaust manifold back and have Jim Bob weld on a 2.5" straight through pipe to a Cherry Bomb sticking out the back. Won't pass emissions but it sounds great and who doesn't love a flame spitting rotary?
#16
I wish I was driving!
If you want it to be obnoxiously loud, spit fire and give a decent HP gain you could cut out all the junk from the exhaust manifold back and have Jim Bob weld on a 2.5" straight through pipe to a Cherry Bomb sticking out the back. Won't pass emissions but it sounds great and who doesn't love a flame spitting rotary?
And no, it won't sound great, even before the packing burns out.
#19
Sharp Claws
iTrader: (30)
just buy a racing beat cat back and call it a day. the new sound will at least make you feel better.
retaining the cats is the largest hinderance to power, so no matter how much time you put into tuning the exhaust or how much you put into it the gains will be almost nonexistent. but if you have to pass emissions that's where you are.
retaining the cats is the largest hinderance to power, so no matter how much time you put into tuning the exhaust or how much you put into it the gains will be almost nonexistent. but if you have to pass emissions that's where you are.
#20
Rotary Enthusiast
iTrader: (1)
Join Date: Nov 2012
Location: bloomington, mn
Posts: 1,100
Likes: 0
Received 0 Likes
on
0 Posts
just buy a racing beat cat back and call it a day. the new sound will at least make you feel better.
retaining the cats is the largest hindrance to power, so no matter how much time you put into tuning the exhaust or how much you put into it the gains will be almost nonexistent. but if you have to pass emissions that's where you are.
retaining the cats is the largest hindrance to power, so no matter how much time you put into tuning the exhaust or how much you put into it the gains will be almost nonexistent. but if you have to pass emissions that's where you are.
#21
Full Member
iTrader: (1)
I plan to put a better one on eventually but I just enjoy driving it the way it is and the raw sound it puts out now. I'm the second owner, my car used to be a garage queen, now she's just haggard. Hahaha!
If you wanna get a legit setup though go with Racing Beat, they've been tuning these engines for decades now and obviously know what they're doing. From what I understand (And correct me if I'm wrong here folks.) rotary engines don't need the same back-pressure from the exhaust as traditional engines do so the quicker you can get it out the better. The only way you're going to see and feel any real improvement though is if you get a header back system with a high-flo cat, a cat back will give marginal gains but just like the other guys said the more flow, the more you'll go.
Last edited by 2nd Chance; 06-28-15 at 12:54 AM.
#22
Senior Member
iTrader: (1)
That's because the people that hate it either don't talk to you or lie to you. The IRL automotive world still mostly works on the principle of, "If you don't have something nice to say, don't say it at all." Hence why they fudge it and say its too loud in a jovial way. It's not a compliment.
#25
Living on the North Coast
iTrader: (31)
I have a mostly stock S5 n/a with a CorkSport header and a Catco replacement main cat in the stock location. I have tried two difference cat backs and kept the Borla setup on the car.
Replacement type cat back exhaust;
Borla cat back exhaust;
What I have learned from all this is that once you put a header of any type on a n/a rotary it will never be "quite" again.
Replacement type cat back exhaust;
Borla cat back exhaust;
What I have learned from all this is that once you put a header of any type on a n/a rotary it will never be "quite" again.