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Old 02-03-2008, 03:28 PM   #1
watchunglava
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hey i have an 07 2.5i i want to get a cat back . im looking at getting a stock sti catback and swaping it. can anyone tell me specs on the sti cat back? will it fit right up? or does the pipe have to be lengthen? also any specs on sti catback such as the size of the piping , inlet and outlet sizes ,?
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Old 02-03-2008, 04:17 PM   #2
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hmmm, how bout trying a SEARCH!?
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Old 02-03-2008, 04:32 PM   #3
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hmmm, how bout trying a SEARCH!?
Yea man, I hate to say it, but someone asks this questions just about every day.
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Old 02-03-2008, 04:49 PM   #4
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I don't know the specs on them, but it should just bolt right up.
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Old 02-03-2008, 05:26 PM   #5
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the axleback will bolt right up, but i dunno about the midpipe, id just go with a custom midpipe from a local exhaust shop....
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Old 02-03-2008, 10:47 PM   #6
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hmmm, how bout trying a SEARCH!?
uhhhhh duh whats a search?????? dumbass i searched for like 20 minutes didnt find the info i was asking about do you know it or do you only know how to like a cows balls? haha nah im just kidding we all know its your mom who licks the cows balls
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Old 02-03-2008, 10:59 PM   #7
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I know the information...pipe diameter and such, but pfft with that attitude
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Old 02-03-2008, 11:06 PM   #8
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I know the information...pipe diameter and such, but pfft with that attitude
wtf its like pulling teeth around here ill just measure it myself in the morning ummm thanks guys for all the advise on how to find an answer , ohh snap you fools are so fly i just dont know what to do without your exaust pipe size knowledge pfft .
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Old 02-03-2008, 11:22 PM   #9
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dont worry about it man alot of the new guys around here are all full of themselves sometimes.... and i wont deny sometimes myself

the sti catback is eh i mean if you got it cheap enough i can see why but otherwise id rather buy a nicer piece. Sti catback is around 2.5" diameter, and a full catback does not bolt on. The axleback would bolt right on for you but the midpipe piece is to short and would need to be modified.
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Old 02-03-2008, 11:45 PM   #10
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it's actually not 2.5" it's a metric size.

PS: you can still shoehorn the 2.5" pipe to fit though...
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Old 02-03-2008, 11:50 PM   #11
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The sti catback will not bolt up without modification. The axelback section will bolt up. No point of using the midpipe from the sti cause its to short and larger piping which will have a small if any negative affect on performance.

Just bolt up the axelback or have a muffler shop custom make you a midpipe.
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Old 02-04-2008, 12:40 AM   #12
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if you read my post i said around...it could mean 1" could mean 3"

my way of bein a stinker and stayin right
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Old 02-04-2008, 05:40 AM   #13
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check boxer4racing.com for stromung exhaust. it is a catback and should bolt up to it. ask the 1st though. also check xcceleration.com for anything else u may need. they are around all the time so if u call at like 8PM they should pick up. i have a stromung on my car and i love it. good luck with it.
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Old 02-04-2008, 11:37 AM   #14
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what about the wrx catback? im doing the stromung mid pipe with a resonator hooking up to the strumung high flow cat. i need an axle back now and not trying to spend loot. i know alot of guys have their old axle backs for sale. what about the wrx im looking for 2.25'' axle back?
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Old 02-04-2008, 11:55 AM   #15
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i love how anytime someone posts about a cheap exhaust theres always someone thats like "just get a stromung." if someone is posting about an STi catback, chances are they're buying it cause its cheap and they don't want to spend $500 or dont have $500 to spend on a stromung.
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Old 02-04-2008, 12:29 PM   #16
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Well for one thing, if it can flow more than enough for 350whp STI's, I think they'll be fine for N/A cars.

I think someone bothered to actually flow test one...it flows something like 90% as much as a straight-thru Prodrive muffler or something like that...
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Old 02-04-2008, 01:21 PM   #17
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2.875 '' 73.025mm is what the pipe on the stock 07 2.5i axle back pipe came to and the tip on the muffler came out to 2.10'' so anything smaller than the 2.875'' 73.025mm on the muffler sould work great i would think because it would create back pressure , but free it up on the high end. what does the sti axle measure does anyone know?
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Old 02-04-2008, 07:11 PM   #18
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Quote:
Originally Posted by jordan s View Post
i love how anytime someone posts about a cheap exhaust theres always someone thats like "just get a stromung." if someone is posting about an STi catback, chances are they're buying it cause its cheap and they don't want to spend $500 or dont have $500 to spend on a stromung.
this is true but the fact than comes into finding a decent shop to get the work done, and than in north eastern conditions how well will their welds hold up... what type of metal are they using to lengthen it, i dont even think stock is stainless so it will die in time

etc etc man, just because people dont say these things its what they are trying to get across to others
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Old 02-04-2008, 07:37 PM   #19
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Quote:
Originally Posted by watchunglava View Post
uhhhhh duh whats a search?????? dumbass i searched for like 20 minutes didnt find the info i was asking about do you know it or do you only know how to like a cows balls? haha nah im just kidding we all know its your mom who licks the cows balls
Holy ****, 20 minutes. Man you must have been about ready to pass out! Do you need some water or maybe a nap? I just did a serach and on my first attempt i found two results for fitting an STI catback on an RS and 2.5i. took me about 3 minutes. I wasnt trying to be a dick, i was just saying do a search. You dont have to lie about doing a serach.

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Originally Posted by watchunglava View Post
wtf its like pulling teeth around here ill just measure it myself in the morning ummm thanks guys for all the advise on how to find an answer , ohh snap you fools are so fly i just dont know what to do without your exaust pipe size knowledge pfft .

Its ignorant people like you that make me embarrassed to be a human being. And if you are going to go with the STI setup i would look into the harmful effects of changing pipe diameter through the exhaust system because changes in exhaust gas velocity may be more harmful than the system you are installing will be helpful. How much is this going to cost, anyway? You may find that for the same $ or a few $ more you can get a clean well matched exhaust setup that will yield better gains and probably last longer (all stainless) than the STI frankenexhaust you might end up with. And btw, try not being a huge douchebag.
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Old 02-05-2008, 04:56 PM   #20
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yep i have it on mine it worked great and for a 100$ catback i cant complain at all.

Quote:
Originally Posted by Subydude81 View Post
The sti catback will not bolt up without modification. The axelback section will bolt up. No point of using the midpipe from the sti cause its to short and larger piping which will have a small if any negative affect on performance.

Just bolt up the axelback or have a muffler shop custom make you a midpipe.
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Old 02-06-2008, 01:15 AM   #21
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the heading on this thread is decieving..i thaught it was an n/a sti lolol
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Old 02-06-2008, 07:50 AM   #22
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the heading on this thread is decieving..i thaught it was an n/a sti lolol
LOL..me too I got all excited.
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