I hear if your car is NA that a 2.0inch exhaust is better for low end torque, smaller exhaust = low end torque, is that correct? Also if I go 2inch exhaust pipe with 3 inch muffler into a 4 inch tip will that be louder then a 2.5>3inch muffler>4 inch tip?

smaller exhaust means more backpressure and small backpressure helps at small rpm's. I think going from small to big makes it louder, so going from 2 to 3 to 4 should be louder than starting off with 2.5. Personally i think there wouldn't be much diffrence. Also i think 3 inch tip looks better than 4 inch, i looked at some 4 inch tips and they looked too big to me.

so basically at a drag strip 2.0inch would probably be the way to go?

i would do 2.5 " with some headers. If the headers and downpipe stay the same there is no need to go above 2". On drag strip you drive at higher rpm's so bigger is better.
at higher rpm's the engine trying to push huge amount of air out; so small exhaust is restricting. On small rpm's small exhaust is just right becuase there is not as much air going out and everything runs fine. When having a big exhaust at low rpm's engine is pushing the air out and it have hard time because there is a lot of area to push the air tru. Try blowing air tru a small straw and big straw to see the difference and then deside what you want. I drive under 2000 rpm rangeso i put empty cats and 20" glasspacks for some backpressure instead of muffler. Having tru duals i did noticed more power at high rpms than before because there is less restriction. hope that helps

who all makes exhaust systems for our cars... im having a hard time findin one. any suggestions?

Ive seen Borla on a stealth before, im sure flowmaster too.

but waht about single exhaust not dual. How would i go about doing that . I want to replace the one i have now. my friend said just get a newmuffler ... but hes the one that told me to cut my springs.!

my exhaust is single, personally I love custom exhaust. a lot cheaper and it will be just as good as a $800 borla. I just got a straight pipe all the way back.

i used to run single wich was straight pipe. I think stealth sounds real nice with stock exhaust with empty cat and no muffler.

if your a NA car I would stay with a single exhaust, and yeah they do sound pretty good with stock exhaust.

http://www.youtube.com/watch?v=fn155P0jITQEDIT: thisis thelast setup with 20" glasspacks

http://www.youtube.com/watch?v=gQpXZngtNHA EDIT: first one in this video is stock with empty cat and no muffler

ok... so im stayin with single and How do i go about gettin a "custome exhaust" like what do i all need to make that happen and how much will it be

any muffler shop should do a custom exhaust. but they may not take out the cat converters as they are illegal, so you may need to find some small privately owned garage to do it.

if you see a muffler shop with small sign and two guys without particular uniforms working on cars, most likely they will put in an empty cat converter for you
the cost will generally run into about $150-250.

so i just go to them and ask them to put one on?? or doi have to find one and take it to them. An once that is on can i put on a new muffler

lol that sucks, my custom exhaust was under 100 bucks, included pipes,muffler,tip, and install, with all cats and resonators removed.

so i just go to them and ask them to put one on?? or doi have to find one and take it to them. An once that is on can i put on a new muffler
Go and ask them if they can take the cat off, if they say yes, then ask them if they could just empty the one you have or put one that is gutted out(if you want yours to look legal)Then they could put a new muffler but you can just take the stock one off and put a 3" chrome tip wich i think would make it better.
lol that sucks, my custom exhaust was under 100 bucks, included pipes,muffler,tip, and install, with all cats and resonators removed.
i put mine for $70 but there was another shop of same type down the street that was asking $150

hahaha look legal. thats awesome!!! Alright so im going to go in today and see if they will do that for me. So im going to have them take my cat off and empty it and see if the can put on a different muffle. An suggestions on a muffler...?

So these straight pipe systems, how much HP gain are you talking about? Is it a noticable difference?

5hp...maybe

ok so since im doing all this stuff is there anything else on my exhaust u would recommend that i get since im already starting to do stuff to it. Like new downpipe or anything.?

You will get the most gains from a new downpipe (or headers), and gutting the catalytic converter (illegal) than you will from a cat back exhaust.

And how much would a Borla get?

Not much.

Ok so for best overall HP gains and performance, My best bet is to get long headers, a test pipe to replace the cat, straight pipe all the way back to a 3" tip? Or should I use a muffler at the end. I don't care about emissions.

i think no muffler would be better.

are test pipes legal??

test pipes are illegal, federal spec cars require 1 cat converter, and cali spec requires 3. A test pipe is a straight pipe put in place of your cat converters. Not all states do emission checks, so if yours dont, you will be safe with a test pipe.

ok well the guy said he wont gut out the cat for me...so how do "I" do it???

you gotta take it off the car, and take out the insides of the cat and put it back on. Easier/faster to just buy a testpipe from www.3sx.com (http://www.3sx.com) and use that instead. Cats are messy and ****.

erg.... how loud will it be then.. Im not really friends with the cops around here .. hehe. They dont like me or my car. So if it isnt to loud all do it. What about a high flow cat.??

I took off my cats and honestly it wasnt loud in my opinion, theres noise laws where im at and they got me for my stereo but never said one word bout my exhaust which is pretty loud. I got 2inch to my rear tires then 2.5inch into a 3inch muffler with a 4inch tip, so it gets pretty loud and they never once complained.

it will be louder with a test pipe than empty cat. A friend of mine emptied his cat with a gas torch. For few days i ran sraight dual with no cat or anything and it was almost as loud as cars from nascar, after i put empty cat in, it got quiet.

You will get the most hp gains from a new downpipe and by gutting the cat. The cat-back isn't that much of a restriction, especially at near stock power levels.

ok so i have get new headers, empty my cat, and put on a different muffler... sound good??

sounds good to me, (i would've still scraped the muffler and did a 3" tip tho, but that's because i can't afford to buy a muffler lol)

Downpipe or headers. For the money, just a downpipe is better than headers. I think 3sx is the only company offering headers right now, and they are quite a bit more expensive than a downpipe and the hp increase is marginal. Is your muffler wore out? If it's not broke, why fix it? Since you are concerned with how loud your exhaust will be, I'd leave the stocker on there till you have at lease swapped the downpipe, gutted the cat. Those two items alone will make your car louder.

http://www.thirdgen.org/techboard/exhaust/338421-more-than-you-ever.html
i thought this might help to some people, i havn't read the whole thing my self but it should explain the backpressure principle. It is from camaro forums tho.

yea my muffler is in pritty bad shape... not going to hold out much longer i dont think.

so is this, with a test pipe, what I should get?

http://www.3sx.com/store/comersus_viewItemBundle.asp?idProduct=1063

Or would long headers be better? Also, where are the O2 sensors located on a 93 ES? There shouldn't be one on the cat because it's older than a 96 correct?

ORIGINAL: zoso

so is this, with a test pipe, what I should get?

http://www.3sx.com/store/comersus_viewItemBundle.asp?idProduct=1063

Or would long headers be better? Also, where are the O2 sensors located on a 93 ES? There shouldn't be one on the cat because it's older than a 96 correct?


downpipe is almost $300 cheaper,. The headers would get you a little more power but are more expensive.
the long headers would get you engine bay to look cleaner too so it's your choice
i'm not sure where the o2 sensor is but i don't think it's in the cat.