The place I got my exhaust done said I shouldn't do the 3inch as I would lose too much back pressure or something along those lines? What does that mean? The 3inch I think sounds better, what do you guys reccommend? Also he said slap an intake and it will sound better. After reading some of the FAQ and threads it seems this is something done later after a tune. I dont plan on doing that or going to that level, I really just want to improve the sound. As I take it, I could add a cobb intake and not run in to issues. So in a nutshell would I be okay to run 3inch tubing and not get back pressure issues (would help if someone could explain this some), or would it be smarter to stick with what I have, and add an intake? Thanks for all the help.
I have the full Cobb turbo back exhaust and its all off 3 inches. Cobb is a premier company and they build 3inch systems for many cars. With a turbo car its important to be able to get the exhaust out efficiently along with any car for that matter. I would go with 3inch as pretty much all major exhaust companies design aftermarket exhaust that way. As far as the intake goes, I run stock as it is good up to 400hp, however if you want more of a turbo sound and a throatier intake note then get the Cobb short ram. Stay clear of cold air intakes as they are trouble with subarus unless you get the car tuned for them.
Cobb's turboback is not 3". Most of the piping is but the downpipe exit is 2.5", meaning it's not a full 3" exhaust. I'm at 400 whp on a full (not just at the end of the downpipe) 2.5" exhaust, abiet I have an EWG. For most setups 2.5" is fine if that's what you get. Buy whichever you want.
And no, the stock intake is not good for 400 hp. And no, CAI are not automatically trouble on Subarus. Nor are all SRI's automatically good for them. It's intake specific.
thanks for taking the time for clarification. do you reccomend the cobb short ram considering i wont be doing a tune in the near future, and its mainly for purposes of sound? So 3" catback would not present issues without a tune? grrr, now im regretting not just buying the stage 2 cobb kit, i should have just done that for everything you get and seems to allow for more mods in the future. but im in the situation im in now and dont have money for it haha so ill just stick to the original plan.
It's tapered. So yes and no. I had a Perrin CAI on my STi and WRX in the past and it performed well. Then again they were tuned and we don't get much rain here.
A turbocharged car doesn't requires back pressure. As far as 2.5 vs 3, meh it could be debated, but 2.5 will work fine for most people means.
Remember kids bigger isn't always better.!Thumbs Up
The 2.5 is a little better at holding the backpressue. Maybe not on the Subie platform but on others having to change idle is the difference between smoking and not when talking about catted and cattless
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