Hey, i searched and searched. And basically found more questions then answers.
I want to make my car a bit more fun to drive, and i was thinking putting in a intake and an exhaust. Now i know there are hundreds of options, but what are the best HP gains you can get, i don't care about the fart noise, i care about the gains. I hear this new Injen intake is supposed to be the best thing to 2.5RSs since the steering wheel.
So basically im wondering, should i get the Injen CAI, and some exhaust system, stay with 1 company like Cobb and get there first performance kit with the CAI and exhaust or what now? im looking for the most gains...and i mean, is it even worth modifying a 4AT 2.5rs with just an CAI and an exhaust (regarding feeling the power). Thank you for your responses...

injec cai is gold on the 05, you seem to have 04. give us a budget on how much you want to spend, and then well just give us a budget :lol:

I have a 4EAT in my RS and let me tell you: the power gain is definately good. Short ram and exhaust (hi-flow secondary cat and 2.25" piping) have been more than satisfying for me. The butt dyno will be happy. :D

Actually, people would get COBB than Injen. COBB specifically makes parts for subaru only, where as injen makes parts for all makes. If you want basic power gain, go for these things.

cobb cai
perrin lightweight pulley
twe equal length header
custom midpipe w/ hi-flow cat
stromung exhaust

if you want, you may get torque chips to give your car more boost. cobb exhausts are stromung exhaust with the letters COBB on the muffler. So just get stromung if u want cobb exhaust. if twe or cobb equal length header is too expensive for you, you can get borla unequal length headers. they dont have as high of a gain than equal length headers but it will keep the "boxer sound". Borla has some problems with their headers before, but now they seem to be okay. I rather stick with TWE though. If you want to custom build your own exhaust, go with 2.25" diameter, anything pass that will lower your low end power and its not worth the extra money. Anything after that would be internals... Hope this helps

yea, i have a 2004, my budget is probably gonna be round a grand, dunno yet. But how much will each item give me in gains(like the cai, pulley, headers, cat, exhaust, and anything else somebody ads)?

And does the super duper ultra cool Injen CAI that all the popular kids are talking about these days only works for the 2005? Now Jessi00, if i was looking into buying a midpipe, what kind of midpipe should i get (also, anybody feel free to answer) also, the sites i have (from long ago when i was thinking of modding are all crap, what are some good sites besides the cobb site to get these nice lil wallet drainers?) Thanks again for everybodies nice replys :-D

Actually, people would get COBB than Injen. COBB specifically makes parts for subaru only, where as injen makes parts for all makes. If you want basic power gain, go for these things.

cobb cai
perrin lightweight pulley
twe equal length header
custom midpipe w/ hi-flow cat
stromung exhaust

if you want, you may get torque chips to give your car more boost. cobb exhausts are stromung exhaust with the letters COBB on the muffler. So just get stromung if u want cobb exhaust. if twe or cobb equal length header is too expensive for you, you can get borla unequal length headers. they dont have as high of a gain than equal length headers but it will keep the "boxer sound". Borla has some problems with their headers before, but now they seem to be okay. I rather stick with TWE though. If you want to custom build your own exhaust, go with 2.25" diameter, anything pass that will lower your low end power and its not worth the extra money. Anything after that would be internals... Hope this helps

IIRC, Tech Works was still trying to design an equal length that would fit a 4EAT.

lil bump, anybody with 2.5rs part sites or knowledge to the questions i asked in post 1 and 5. Thanks

IIRC, Tech Works was still trying to design an equal length that would fit a 4EAT.

Its been out for awhile.

Link (http://www.techworkseng.com/Products/Subaru_Performance_Exhaust.htm#headers)

"NEW Header (4-2-1 Super Sport)
(Fits automatic transmissions)"

Clicky (http://www.techworkseng.com/News/Releases/05-15-05.html)

lil bump, anybody with 2.5rs part sites or knowledge to the questions i asked in post 1 and 5. Thanks

Boxer4racing (http://www.boxer4racing.com/)

Cobb Tuning (http://cobbtuning.com/impreza/)

Rallitek (http://rallitek.com)

...just to name a couple

RS25 (http://www.rs25.com)has ALOT of great talk regarding these things for your particular car...unfortunately its down and probably will for a little bit.

^^^ true. But the money needed for a EL for a 4EAT? Hmm... I just can't justify it.

so why dosn't the 2005 injen intake fit 2004s? i tried searching, but couldn't find anything

also, any other sites besides cobb, boxer, and rali? i rather not deal with boxer since i ordered a intake once from them and they sent me one saying its for my year and when it couldn't fit i called up injen and they told me they don't even make a intake for my year (back in the day) so....rather stay away from them...

so why dosn't the 2005 injen intake fit 2004s? i tried searching, but couldn't find anything

because one year uses MAP and one year uses MAF... That is why you cant use it.

so for the best gains, im stuck with pricy ol cobb then, right?

cobb is pricy but its worth the money. so yes, go with cobb for cai

Intake choices include Cobb, Weapon R, and Ganzflow. Cobb sticks out of the crowd.

so whats a good catback exhaust system? and whats the site to get them from? (like stromung...where would i be able to get them besides through cobb or boxer4racing)

Cobb - Cobb, the only play to buy it.
Stromung - Other than boxer4racing...their main site. Call em up
Borla "Hush" - Borla
or your best bet...do a custom one. muchos cheaper! or find a clean used one.

I think I'm going to buy that EL TWE Header

what are your suggestions for catback? for best gains gotta stick with cobb or???

mariuslt, stromung IS cobb. stromung make the exhaust for cobb. So dont spend the extra money getting cobb name over the muffler and get stromung instead. Stromung sounds nice too

Many people, including myself, like the Stromung exhaust the most.

so where can i get the stromung exhaust and also what would be the stromung part number or model number and diameter? Thanks again jesse0

like on http://www.stromung.com/subaru/price1.htm
what part numbers do i want...im guessing for a full cat back, ill need a muffler of my choosing and a pipe...anybody know the difference between the "race only" and the other pipe? Also which muffler is best for best gains? Thanks again everybody

The Stromung website is NOT updated, so you will have to actually call them for an order. Not sure about email though...

IF YOU CHOOSE TO GET COBB EQUAL LENGTH HEADERS MAKE SURE YOU GET THE POLISHED COAT ON THEM !!!!! i have had mine for a very short time and there starting to rust out already with no winter weatherd on them at all.... its my own dumb ass fault though for not springing the extra 200 for the polished coating.

thats why get twe el header instead. there isnt any report about twe headers rusting, so its a better quality item. and does cobb offer 4eat headers or just 5mt?

Its been out for awhile.

Link (http://www.techworkseng.com/Products/Subaru_Performance_Exhaust.htm#headers)

"NEW Header (4-2-1 Super Sport)
(Fits automatic transmissions)"

Clicky (http://www.techworkseng.com/News/Releases/05-15-05.html)

Did not know that. Thanks for the info.

thats why get twe el header instead. there isnt any report about twe headers rusting, so its a better quality item. and does cobb offer 4eat headers or just 5mt?

works for both.

I’ve decided that I want the Cobb CAI, and I also know that I wanna go cheap and go for the Stromung exhaust system….now, for the least amount of money and the most gains…what can I do? I don’t want to get headers, the people at stromung told me that the muffler by itself will give me about 6hp gain…with out anything else…people at cobb told me that all the muffler is gonna do is change the tone of the exhaust…which is what I thought. So my biggest question is…for the best gains and best tone of exhaust should I:
A. just save the money, get the CAI and the muffler and be happy with the tone and very lil gain
B. get the CAI, get a high flow cat and get the muffler (any gains? Or will it just choke with the mid pipe being stock?)
C. get the CAI get the high flow cat, and get the entire cat-back system (with legal non-straight mid back pipe, I wanna be legal) and be completely and utterly broke?

First of all, Stromung is not exactly cheap. If you want to go with the last expensive, just go with the custom exhaust. Stromung is complimented by many users here however, saying it has a very nice tone for the subaru. If you still want stromung though, I'd recommend you just find a nice used one. If I were you, I'd do the whole thing. Do the catback, not just the muffler. Don't do the same mistake I did...unfortunately I picked any ever crappier muffler than the famous stromung. Even with the intake, if you don't want to spend the extra bucks for a NEW one, find a used one. There are usually some around here. What I would do...save up your money. Get the Cobb CAI, but when it comes to exhaust, do the whole thing, a catback and if you'd really like to, get the high flow too. Hope this helps.

so not getting the high flow won't restrict any airflow or anything like that?