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exhaust abd intake for a 2.5i??

Old 07-20-2010, 07:50 PM
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exhaust abd intake for a 2.5i??

What would be the best exhaust in your opinion for my N/a? and also intake? and would i have to get it tuned after getting these thing? i wasnt sure since i dont have a turbo.. also do you think headers would be good or a waste of money? what size exhaust? thanks for your help.
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Old 07-21-2010, 01:17 AM
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What are you looking for? Do you want more power or just some noise?

Power wise there isn't much you can do other than a tune. Cobb recently released an AP for 08+ NA and they are showing gains of 15hp on stock internals.

An intake won't do much other than void your warranty and freak out you MAF sensor which in turn throws off the air/fuel mixture and flips on the CEL. If you decide to get an intake you will need to be tuned for it. Here is a ****ton of info on intakes for 2.5i's http://forums.nasioc.com/forums/show....php?t=1471819

With exhausts, you won't see any power gains unless you remove that cats which is kind of a PITA currently because no one makes any catless or even high flow cat components for the 08+ 2.5i and you would have to get it all custom fabricated. Same goes for headers especially since there is a cat in the headers as well. Actually it gets a little complicated, if you some research you will find out why.

However you can bolt up any WRX catback on and it will work. If it is made for WRX it will fit. If you go bigger than 2.5" piping you will lose quite a bit of throttle response but the overall powerband will be a bit smoother. If you get 2.5" piping the car will preform the same as it does now but it will be louder.

Currently, I have a full 3" SRS N1 catback on my 2.5i. It is loud as **** (which I like a lot) but the throttle response isn't quite there. But since it is a N1 exhaust I can stick a silencer in the end and that leaves about a 2" opening and the performance is near stock but a lot quieter. This would go for any N1, The three companies making them are SRS, Tsudo, and Invidia. SRS is the most quiet out of the three and Invidia race is the loudest.
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Old 07-21-2010, 02:11 AM
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Thanks a bunch. So basically, dont get an intake, get the SPT wrx exhaust and get the cobb AP? an ill see a gain of around 15hp and my car will sound like a real subie with the SPT exhaust?
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Old 07-21-2010, 02:34 AM
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Exactly, but it won't sound like a "real" suby, it never will because it lacks the turbo and unequal length headers. You can get pretty close to the boxer rumble but it will not be th same. It will still sound pretty nice though.
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Old 07-21-2010, 09:34 AM
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haha. i checked out that Cobb AP. holy Shheeez. 600 bucks. but it does look sick! you can select maps and change them for what kind of driving. i never knew that. but i read that they are going to stop selling it in august. but for sure im going to get that SPT exhuast just for a little better sound. anything else i can do to increase power? besides slappin oon a turbo?
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