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Old 09-16-2010, 04:51 PM   #1
hedkandi
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Default Exhaust/CAI options for 2008 impreza N/A hatch?

Just traded my mazda3 in for a 2008 n/a impreza hatch and am struggling to find a decent exhaust and CAI that will fit my car. I've searched a decent amount but I'm only finding information on pre-2008 N/A's.

exhaust....
People have told me that WRX exhausts will fit my car if it's for a 2008+ wrx hatch, but I've seen 2008+ wrx/sti exhausts online that clearly stated that the exhaust will NOT fit a non-turbo. Will the WRX hatch exhausts fit my car?

CAI....
All I can find are SRIs which I don't want (put both a CAI and an SRI on my mazda3 and the CAI performs 5x better). I've looked at the engine bays for both the 2008+ and the pre-2008 and they look similar, so would the CAIs for the pre-2008's fit my 2008?

Thanks!
Nate
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Old 09-16-2010, 05:07 PM   #2
RaineMan
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Have you read the sticky about CAIs on NA Imprezas causing a rich condition and potentially damaging the engine? You may not even want one.

http://forums.nasioc.com/forums/show....php?t=1471819

I know it mainly mentions the older models... but AFAIK this still holds true for the new models.

As far as exhaust... I am just replacing my axle back section and muffler with one from a WRX for better looks and a tiny bit more sound.
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Old 09-16-2010, 05:13 PM   #3
hedkandi
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I did read that CAIs make NA imprezas run rich, but I was hoping that they would have fixed it by 2008 since a lot of the people mentioning that issue had 05s, 06s, etc.

I thought about just replacing my cats w/ highflow cats and throwing a new muffler on but I don't want to just drop money on random cats and a muffler and not get a tone that I want. I guess I need to do a little more homework about that. Can anyone start that off for me by telling me the diameter of the 2008 n/a's exhaust?
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Old 09-16-2010, 10:18 PM   #4
iRazor
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2.25 is the diameter
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Old 09-16-2010, 11:12 PM   #5
09suby
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Quote:
Originally Posted by hedkandi View Post
I did read that CAIs make NA imprezas run rich, but I was hoping that they would have fixed it by 2008 since a lot of the people mentioning that issue had 05s, 06s, etc.

I thought about just replacing my cats w/ highflow cats and throwing a new muffler on but I don't want to just drop money on random cats and a muffler and not get a tone that I want. I guess I need to do a little more homework about that. Can anyone start that off for me by telling me the diameter of the 2008 n/a's exhaust?
you could run any intake you want bro, you will just need a tune. Cosmoracing makes one, I would just change the filter out. Avo makes one. Im not sure on any other. There is a guy who sells intake that he makes for our models.
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Old 09-16-2010, 11:17 PM   #6
renyo
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Quote:
Originally Posted by hedkandi View Post
I did read that CAIs make NA imprezas run rich, but I was hoping that they would have fixed it by 2008 since a lot of the people mentioning that issue had 05s, 06s, etc.
It's not an issue unless you have a CAI, so Subaru really has no reason to fix it. From what I remember someone with an 08 did log and found they had the same problem. Although, my memory sucks sometimes.

Quote:
Originally Posted by hedkandi View Post
I thought about just replacing my cats w/ highflow cats and throwing a new muffler on but I don't want to just drop money on random cats and a muffler and not get a tone that I want. I guess I need to do a little more homework about that. Can anyone start that off for me by telling me the diameter of the 2008 n/a's exhaust?
If you want the infamous boxer rumble, you're gonna need a UEL header and everything that's required to fit them on the newer models. You can still get some rumble from a properly setup exhaust with an EL header, but it's not completely the same. It still sounds good though.
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Old 09-16-2010, 11:38 PM   #7
nairbmik
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CAIs are absolutely useless. Wastes of money, I'd rather spend those hundreds of dollars on a nice suspension set up than a puny 5 HP gain. They all give you CELs, and take that low end power than NA engines have and move it up toward the 4000 RPM range.

Exhausts are just a money waster as well, they won't give you any real worthy gains. Plus you won't get the boxer growl unless you have unequal length headers, which the 2.5i does not come with, it comes with equal length headers since they are more efficient and produce a bit more power. You will need to get borla replica UEL headers, but with the new models fitment is tricky and you'll likely need custom fab. Exhausts are strictly for sound, not much more. If you have money to burn and are looking for a good sound, go for the exhaust.

I'd spend the money on a rear sway bar first, your car doesn't come with one. That's why it have massive amounts of body roll and understeer.
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Old 09-17-2010, 12:10 PM   #8
hedkandi
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Quote:
Originally Posted by nairbmik View Post
CAIs are absolutely useless. Wastes of money, I'd rather spend those hundreds of dollars on a nice suspension set up than a puny 5 HP gain. They all give you CELs, and take that low end power than NA engines have and move it up toward the 4000 RPM range.

Exhausts are just a money waster as well, they won't give you any real worthy gains. Plus you won't get the boxer growl unless you have unequal length headers, which the 2.5i does not come with, it comes with equal length headers since they are more efficient and produce a bit more power. You will need to get borla replica UEL headers, but with the new models fitment is tricky and you'll likely need custom fab. Exhausts are strictly for sound, not much more. If you have money to burn and are looking for a good sound, go for the exhaust.

I'd spend the money on a rear sway bar first, your car doesn't come with one. That's why it have massive amounts of body roll and understeer.
I'll hold off on the CAI for now... but I will say that it gave my mz3 a lot more balls. Definitely more than 5hp.

I want the sound. It's odd for me to drive a car with no sound after having a car with an aftermarket exhaust for 2.5 years.

I will pick up a rear sway. Any suggestion on brands to save me from the homework?
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Old 09-17-2010, 01:30 PM   #9
nairbmik
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I meant to say 5 WHP. Since its an NA engine, plus its paired with the AWD drivetrain power loss, not much power is being made.

You have many options for a rear sway bar. You could pick up a stock WRX or STI rear sway bar from someone who went aftermarket. You'll just have to pick up the endlinks and mounting bracket from your local Subaru dealer. Another option is the rear sway bar (or front and rear package) from Rallitek : http://www.rallitek.com/RalliTEK-Rea...08-2010/p-4384
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Old 09-18-2010, 01:29 PM   #10
hedkandi
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You wouldn't recommend Eibach's rear sway?

http://www.autopartswarehouse.com/de...277717312.html
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Old 09-19-2010, 11:05 AM   #11
roanokeimpreza
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The best bang for your buck upgrade is the rear anti-sway bar. I got one off a STI and it made a big difference.

I also added a WRX catback to my 2.5i. The resonator is an improvement and tip looks alot better. It sounds slightly better at WOT. The aftermarket exhausts for a WRX would make it louder but because of their diameter you could lose a few Hp.

In my opinion the most performance gains can be had by upgrading the tires and wheels. Of course that'll cost you.
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Old 09-19-2010, 01:49 PM   #12
Bootzy
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Is the wrx 3" aftermarket exhaust too big for the 2.5i? I dnt really care aboutthe few hp I'll lose...I just want to kno if the back pressure loss will mess anything up?
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