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I'm about to buy an exhaust system for my 01 coupe ex. And debating on whats better and I need some help. Whats the difference between 2.25" piping and 2.5" piping. (Besides the size. DUH!) what does it do with performance and sound? I know it all depends on what you have on your car and what kind of muffler you get. But I'm asking in general. whats the difference between the two sizes?

 
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No SOHC will get much if any performance out of an exhaust system. with a 2.5 you will lose Tq. If you are looking for a different sound get an Axle back, and save yourself some money.

 
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i got a question what's the difference between the pipe sizing fi you were boosted...say differences between 2.5" and 3"??

 
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so im assuming the axle back doesnt go as far back as a cat back. sorry. being noob right now. so you're saying dont even mess with the piping size and just go with an axle back?

 
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its up to you, some people like getting cat back and some people like getting axleback, now there is really only one axleback that most people have and its called the hks hi power. An axle back exhaust is basically an exhaust from the axle-back(rear wheels) i personally like a cat back exhaust because there are more options to choose from than just an axleback

 
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well, what about piping size with a catback for our cars. i hear about 2.25 and 2.5 inch piping and something to do with back pressure and naturally aspirated engines.

I might get one of these two. I just wondering about piping size. cuz one is 2.25. and the other is 2.5 (copy and open in new explorer. havent reached my 15 post minimum to post links)

cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=012&item=220001079926&rd =1&sspagename=STRK%3AMEWA%3AIT&rd=1

cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=011&item=320000367031&rd =1&sspagename=STRK%3AMEWA%3AIT&rd=1

 
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dont go with that ebay crap...get a name brand, you never know what those will sound like. I have the skunk 2 megapower and i think thats 2.25 but i really dont think the .25 will make a difference at all

 
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hmm... well what about a hayame catback. thats the only name brand one i found for cheap bundled with a DC header on ebay. and im also leaning towards APEXi N1 cat back.

 
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ok ok ok...

Axel back = Cat back just FYI.

Go with 2.25 if you just geting bolt on mods.

Turbo? Go with 2.50 OR if your a bad *** with some crazy T3/T4 or some thing like that get the 3.0 inch piping.

PS: I have Apex-i N1 exhaust & I love it!!!

 
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what do you mean axle back=cat back...if you mean performance wise yea but not actual product

 
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I bet the HKS hi power axle back is the "same length" as say Apex-i's cat back.

They both start to bolt up after the cat.

 
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axle back bolts up after the cat by teh axle...the pics of it the pipe is a lot shorter than the cat back ones

 
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Ok bro im not gona argue with you. But I think were saying the same thing.

Whatever. Post pics if you like.

 
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im not arguing with you either, im just saying it...i dont see why you are getting mad

 
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Im not mad man, I just "think" they are the same thing.

Axle back & Cat back.

Like you even said the axel back bolts up after the cat so does cat back...

 
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Axel back bolts up by the rear axel. Cat connects to midpipe then the midpipe connects to the axel back exhaust.

Catback bolts up to the back of the cat. Replaces the midpipe with the larger size, ie. 2.5, 2.25.

Hence, catbacks are generally more expensive.

Axel back exhaust, generally will not be as loud as a cat back system, so, there is a better chance of not being noticed by the cops.

PM me if you have any more questions. You can talk to Dezod or Truehonda or any other vendor on this site and they can explain the differences of each model to you.

 
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ok... axle back does bolt up after the cat... but way way after the cat close to the rear axles...hense axle back... cat back is directly after the catalytic converter.... oh and 02blkcivic thanks for the answer to the piping size. i'm going to boost with a t3/t4 turbo... soon anyway!

hahaha...mkingk2... you answered before i did...lol

 
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Good glad we got that cleared up!

my bad I "thought" they were the same...

 
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how much did you pay for your apexi n1?

 
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$450 in my hands. (local shop)

 
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how much do DC headers usually cost? like 400 or 450? i just got some for like 120. lol!

 
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I paid $300!

But there are a lot of "cheap imitations" out there.

So watch out!

Back at ya!

 
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oh. mines legit. got the dc logo etched in or whatever. welded. yea. haha. WHATEVER! its legit!

 
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For sure! As long as it has a cereal number your good to go!!!

 
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i got my dc header for $60 off this site. he totaled his 7th gen so he sold it to me really cheap. i got my greddy evo2 off this site too. 2.5 inch piping which is good cuz im gonna be boosted soon .

 
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is it bad to have 2.5 piping if you're just n/a? or its just not as good as having 2.25 piping?

 
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are you trying to get power or just sound?
I got Kamikaze header with 2.25 custom exhaust with MagnaFlow Universal Catalytic Converter-53000 Series and 2.25- Vibrant proformance Stainless Steel Resonator ending with HKS Hi-power muffler

sounds good but I think I lost low end and gained top....
I think any bigger would only hurt you performance wise

 
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well, im just trying to get a deep low tone. bassy sorta. like apexi n1. i dont want farting or sounding like a moto cross bike. lol. know anyone with a hayame catback and a dc header setup?

 
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the axel back doesnt come w/ the b-pipe

the b-pipe ends somewhere around the back axels ....axel back

the cat back comes w/ the b-pipe which bolts right up to cat