3" exhaust on an NA car?
 

Anyone ever run a 3" exhaust on a non-turbo car?

I have my 3" left over from when I was turbo, but I'm just NA now for my daily. The stock civic exhaust is all rotted so I Was gonna throw on the 3" with my B-swap I'm doing...I have a 2.5" header which I'm going to have feeding a 2.5 in/out cat, 2.5" in/ 3" out resonator to a 3" hooker muffler...just trying to figure out how loud it'll be. I'm thinking w/ the resonator and muffler I should be ok right? Maybe I'll double resonate it, not sure if i'll have all that room down there tho.

I just dont want to be hassled by the Po.

Re: 3" exhaust on an NA car?
 

my 3 in with turbo wasent to bad no res though i only got fucked with after 2am. ususally they would bitch about the tint and then say and your cars loud

Re: 3" exhaust on an NA car?
 

Big power all motor 220+ likes 3 inch exhausts

Re: 3" exhaust on an NA car?
 

you can run 3" but turbo friendly mufflers won't make it any quieter

Re: 3" exhaust on an NA car?
 

it will sound like ass.. just fyi.. I run straite pipe for the turbo, but i to am going to be na for a little while.. im just going to leave the reamining stock exhaust on the car, because i dont want to sound like a ricer, and than have a slow ass car to back up the status..

Re: 3" exhaust on an NA car?
 

I have 3" turbo back with a straight through type muffler and think it's too loud even with a turbo.

When I swapped a b16 I was a ----- and wanted to practice tuning it before putting the turbo back on, that lasted less than a week it was so god aweful loud and ricey. It sounded so ------- horrible and I carried ear plugs with me it was so loud.

Re: 3" exhaust on an NA car?
 

yup i remember that ---- lulz were had

Re: 3" exhaust on an NA car?
 

Back in the day I had an integra with Madd tyte JDM one piece header a blox intake mani and a 3 inch cat back. ---- was stupid loud but sounded good for what it was and fun to drive. Then I sold it and got into boost. I wish I still had that car, it would have been a nasty turbo car!


Looking for pics!

Re: 3" exhaust on an NA car?
 

i agree with chris, good for High HP NA cars, but for regular na car it will be loud as ----. I had a straight piped no resonator exhaust on my old GSR coupe it sounded good but attracted too much attention :(

Re: 3" exhaust on an NA car?
 

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Re: 3" exhaust on an NA car?
 

i have a 3" on my H and it doesnt sound bad at all. Its only really loud inside the cabin because mine isnt a full catback and dumps before the bend at the gas tank so i get a lot of incabin resonation from the ground. RMF header / 2.5" magnaflow cat / 3" piping with 17" vibrant resonator. No rasp whatsoever.

Re: 3" exhaust on an NA car?
 

itll be loud. when i went back stock. had the 2.5 inch turbo back, figured why the ---- not. ---- was annoying and loud. stock pipe got slapped on the day after.

Re: 3" exhaust on an NA car?
 

Pipe diameter makes more of a difference than resonators and mufflers to killing engine noise.

And, I'm going to disagree with chris. I like 3" exhaust on any all motor build targeting 200+, his 220+ figure is too damn high and you'll lose power if you brush past 200.

Re: 3" exhaust on an NA car?
 

hmmm well this is just gonna be a 82mm gsr w/ itr cams and 11.6:1 comp...nothing too crazy, prolly like 180-190whp

i figure with 2.5 to basically the gas tank where it bends (ek civic) shouldn't be THAT bad...might have to ditch my straight thru hooker for an OEM type muffler.

hmm maybe an s2k muffler? gotta find out what the inlet piping is on that, i know its "twin loop" which is cool

Re: 3" exhaust on an NA car?
 

http://s23.photobucket.com/albums/b3...t=MOV00020.flv
http://s23.photobucket.com/albums/b3...Prelude015.flv

3in na sucks

2.5" > 3"

For my jetta this summer I'm put a 2" exhaust with a cherry bomb glass pack and only the 2nd. stock muffler.

nice i like it

Yes, you can run a 3 in exhaust on an n/a car, but you won't make the best power with it.

It sounds nasty!!! I would stick with 2.5 or less

pointless 2.5 is the best i think

I think that 2.5 should be better. I have a 2.5 in my coupe. 3 in a turbo car.

Get a better engine. All of the sudden, 3" > 2.5".

3" in a n/a car will also be hella loud...................

do a 2.5" setup, dyno it. then do a 3" setup, dyno it

post results.

2.5" is more then enough. if you put 3" you'll lose low end hp, and you'll feel the power loss.
I had a 4-1 header, 2.5" and glass pack on my NA LS, and I could feel the loss in power at low end. it started to pull hard at 4500 rpm.it would have been much better if I had the ls with cams and other bolt on's with the 2.5". but in GSR's 2.5" is good.
Even with small turbo builds 2.5" is good enough. when you start moving up more then 250hp, that's when I'd put 3".

You got to remember back pressure. if you don't got enough back pressure you'll loss hp.

^ I agree. You really don't have a need for anything more than 2.5"

Depends on where you live at and the laws varies on what you can have or get away with.

It will probably only hurt hp or torque a little

trade me your 3in for my 2.25 and then we both win8)

try it out and let me know cause Im debating same thing but Im also gonna run over 100hp shot of nitrous in my built h22

H22 is a different story. H22's like the 3", all day.

awesome. I was more for the 3" anyways. thanks buddy

So you just wait for some random dude to post something supportive, after countless people have argued the contrary? First of all, I'd go with the masses. Secondly, I haven't seen a single dyno sheet posted, so no one here has said anything you should believe.

every1 was talking about B-series engines. which 2.5" is good.
But he asked about H22's. an h22 is a different story, you can find info on it on a prelude forum if you don't believe me. I say 3" is good for his H22 set up. he said he's got a built h22 with a 100 shot.

Dyno?

its not only an h22, Im also gonna have a 100 shot of spray so the 3" exhaust is def gonna help out. so just say over 300hp. Im pretty sure the 3" is gonna be better for my setup than the 2.5. When I get done with my setup and running right I will hit up the dyno.

How do you know 3" is going to help, without dyno-ing it before? An after dyno tells you nothing if it isn't compared to a before. You're just going into this completely blind, and making assumption after assumption.

You NEED EXHAUST VELOCITY, NOT BACK PRESSURE.

Everyone here keeps speaking in general terms, too. Naturally aspirated exhaust size depends on your setup and where you want to make power.

ok so you dont think 3" exhaust will be any good with 300+hp? lmao. do your research, there are dyno sheets out there if you just look. and it shows power gain even after 2.25 exhaust to 3" through the intire powerband. so thats proven fact that the h22 likes the 3" exhaust with minor bolt ons and with nice cams it will really set it off.