DC350

yeah, just like the titale says, how loud will it be if i gut the cats? Thanks


~evan

baix2

i have straight pipe + apex n1 single, it's like deep low tone, so not necessary THAT loud comparing to those accord with like 4in tip exhuast

only got one ticket in almost 2 yrs for exhuast modification

tmak26b

All depends on what mufflers you have, I had gutted cats with RB mufflers and stock mufflers. They were very quiet, but gutted cat gives you the chainsaw sound

DC350

I have stock Mufflers, my car is BONE stock, cept a cd player and 20w-50 oil thats my mod, lmao

tmak26b

if you gut it, it wont be loud at all. Just make sure you dont have to pass emission after. I just swapped back from gutted cats to high flow cat. I did lose some power, but car dont smell like foot cheese

SaabGuy

DO NOT GUT THEM
they sound horible, not loud, just crapy shitty chainsaw can like. Take a big can and beat it with a mallet, thats what it sounds like. The cats are too thin. If you want gutted cats I'll trade with you. I need GOOD cats for an 87 tII.

I really wish I didnt gut mine.. BIG mistake

Buy a straight pipe or else you are gonna kick yourseld in the long run

DC350

what will a straight pipe sounds like for an N/A with stock mufflers?

Rattaan

Go out and get the straight pipe, like Saab guy said. If they are still working then you can always put them back on if you need them again. I went out and got a straight pipe made for $80. and with my HKS sport cat-back it only sounds a little louder than with the cats. If you don't live in an area that has an e-check you could probably sell them an end up with a decent sounding straight pipe for really cheap. Anyway, have fun!

DC350

ok ok ok, i am a little confused here. A straight pipe would be like headers or something right? or, a combo of a down pipe and a straight pipe or what? cause i need some input, i got some money here and no emissions...


Thanks!

ponykiller

I put a straight pipe on my '91 N/A 'vert and it sounded sweet!! I still had stock mufflers, but going with a straight pipe blows them out after about a week (actually more like a day, but who's counting?). Don't go with gutted cats, buy a real straight pipe, or go to a muffler shop that will cut your cats off and weld a straight pipe in for you. That is what I did, and it only cost $45 (all parts and labor included). If I was going to do it again, I would buy two flanges that fit whatever size piping you want to use and take them with you to the muffler shop, so you can have the pipe welded to them and then the flanges bolted in place, making a straight pipe, for much less-Just in case you ever had/wanted to put your cats back on.

Kris

NZConvertible

Stop confusing yourself with all these names. It's all just hollow pipe that exhaust gases go through, not rocket science.
The cat is a restiction, get rid of it. Replace the whole system if you have the money, instead if pissing around with bits and peices. You'll get a bigger gain with a new system on the stock exhaust manifold than the stock exhaust on headers, so if the budget won't stretch to doing the whole thing in one hit, leave the stock manifold for now.

NjFC3S

So I was looking for a muffler shop earlier today to make me a 3" midpipe and nobody wants to do it 'coz of the fear of getting fine for removing the cat. I'm not sure about other states but here in jerzee they're becoming more stricter. I have the 3" RB downpipe and also a full 3" catback that's why I want a 3" midpipe. Oh well, I guess I'll just go ahead and order the RB presilencer then.. By the way, does anybody know if the RB presilencer will let me take my airpump off or leave it on? Thanks and sorry for the long novel!

Nj

Skippydog

Ok I just removed my cats and had a pipe welded in its place. No it not raspy or like a chainsaw it sounds a little deeper and a tiny bit loader then stock. Not much difference. A little power increase but that might be just in the brain no dyno to prove it.

88na

NZConvertible

There's an easy (if slightly more expensive) solution to your problem. They're only liable if they remove the cat. Just measure up the length of the cat and size of it's flanges, go to an exhaust shop and ask them to make up a bit of pipe with two flanges on to your dimensions. They should be happy to do this. Take it and fit it yourself; don't forget gaskets.
If you remove the cat, you can ditch the air pump as well as the ACV.

Ryde _Or_Die

Isn't the N1 tip like 3.5 or 4"?

baix2

yeah i think it's 3.5 in i wasn't just comparing my car to accord or civic with just the tip size, talking about the the tone of the exhuast sound
u know an RX-7 sounds different than those accords and civic out there.
mine's like deep low tone

Stepdaddy

ahh mine has a brand new exh. im all about running 4 inch strait pipe and 5 inch bomb mufflers i have no emisions to pass im just all about shooting some flames when i beat on hondas

Stepdaddy

did i mention i hear more noice from the front of the car than the muffler i like to make my shifting on the sound of the engine i do use the tack though

DC350

i read that takin off the air pump will make the 6 ports not work correctly? is that True....Could i be able to make the air pump shoot the air that it uses to shoot into the exhaust pipe into the cumbustion chamber....sorta like A SUPERCHAGER with .5 lb of boost? This sounds like an intresting subject to reflect on

NZConvertible

Series 5's use the air pump to open the aux ports, Series 4's use exhaust backpressure.

Ahh, no... just no...

Ryde _Or_Die

Uhh...you do got the first part correct I guess. I mean people wire the aux. ports open sometimes so you wouldn't need the airpump.

Uhhh...the airpump doesn't provide **** for pressure, I think the intake pulls in air faster than the airump could pump air in and would prolly just mess up the flow. By the way, you want to shoot air into the exhaust or in the engine?

tmak26b

why would u wire the 6 port open if it is working. did it to save like 15lbs? I prefer the low end torque ....

NjFC3S

You know what NZ, I never thought of that before. I guess I was just looking for the fastest way out without doing the job myself, 'coz of the cold temp outside, of course. Anywayz, let me give it a try and see what happens.. I'm off this Friday morning. Thanks a lot man!

MaxRX7

"If your still conscious it's not loud enough"

fuzzi

Actually it can be done... (using air pump as supercharger) although it doesnt give enough air.. The amount of paristalic loss taken from running the belt would be more than you would gain, so your car would just be slower....Maybe if you ran like 5 of them .. it would work lol. Me and my buddy were experimenting with it on a lawnmower though...that would be cool...