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Old 08-29-2005, 12:08 AM   #1
Mariuslt
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Default 4AT 2.5rs power gains?

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...
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Old 08-29-2005, 12:18 AM   #2
svek
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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
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Old 08-29-2005, 12:27 AM   #3
that1dude
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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.
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Old 08-29-2005, 12:29 AM   #4
Jesse00
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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
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Old 08-29-2005, 10:08 AM   #5
Mariuslt
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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
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Old 08-29-2005, 01:41 PM   #6
elijah25rs
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Quote:
Originally Posted by Jesse00
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.
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Old 08-29-2005, 06:26 PM   #7
Mariuslt
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lil bump, anybody with 2.5rs part sites or knowledge to the questions i asked in post 1 and 5. Thanks
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Old 08-29-2005, 08:32 PM   #8
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Quote:
Originally Posted by elijah25rs
IIRC, Tech Works was still trying to design an equal length that would fit a 4EAT.
Its been out for awhile.

Link

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

Clicky
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Old 08-29-2005, 08:36 PM   #9
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Quote:
Originally Posted by Mariuslt
lil bump, anybody with 2.5rs part sites or knowledge to the questions i asked in post 1 and 5. Thanks
Boxer4racing

Cobb Tuning

Rallitek

...just to name a couple

RS25 has ALOT of great talk regarding these things for your particular car...unfortunately its down and probably will for a little bit.
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Old 08-29-2005, 08:37 PM   #10
HolyCrikey
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^^^ true. But the money needed for a EL for a 4EAT? Hmm... I just can't justify it.
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Old 08-29-2005, 11:29 PM   #11
Mariuslt
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so why dosn't the 2005 injen intake fit 2004s? i tried searching, but couldn't find anything
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Old 08-29-2005, 11:41 PM   #12
Mariuslt
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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...
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Old 08-30-2005, 02:28 AM   #13
Jesse00
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Quote:
Originally Posted by Mariuslt
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.
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Old 08-30-2005, 02:45 AM   #14
Mariuslt
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so for the best gains, im stuck with pricy ol cobb then, right?
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Old 08-30-2005, 03:20 AM   #15
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cobb is pricy but its worth the money. so yes, go with cobb for cai
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Old 08-30-2005, 04:13 PM   #16
Iceman12321
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Intake choices include Cobb, Weapon R, and Ganzflow. Cobb sticks out of the crowd.
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Old 08-30-2005, 04:57 PM   #17
Mariuslt
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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)
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Old 08-30-2005, 05:00 PM   #18
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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.
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Old 08-30-2005, 05:10 PM   #19
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I think I'm going to buy that EL TWE Header
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Old 08-30-2005, 05:39 PM   #20
Mariuslt
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what are your suggestions for catback? for best gains gotta stick with cobb or???
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Old 08-30-2005, 07:16 PM   #21
Jesse00
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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
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Old 08-30-2005, 07:30 PM   #22
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Many people, including myself, like the Stromung exhaust the most.
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Old 08-30-2005, 07:48 PM   #23
Mariuslt
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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

Last edited by Mariuslt; 08-30-2005 at 07:56 PM.
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Old 08-30-2005, 08:52 PM   #24
Iceman12321
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The Stromung website is NOT updated, so you will have to actually call them for an order. Not sure about email though...
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Old 08-30-2005, 11:13 PM   #25
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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.
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