[jwebb335xi]

Hey everyone,

I have a 2008 335 xi (sedan) with CP-E downpipes among other modifications. I'm trying to get to 400 awhp without meth or ethanol and I'm sitting at about 375 awhp at the moment. I have NOT done a cat-back as of yet mostly because it's hard to choose the right sound, but also the cost is pretty substantial.

Thats said, I'm leaning toward a CP-E system because the downpipes were such high quality stuff.

Does anyone have (1) a dyno comparison with and without CP-E cat-back to determine the potential gain from that modification on a pro-tuned car and (2) pictures/sound clips that show off the tail pipes and sound??

I've seen the Cobb set-up in the flesh and love the sound but I don't like the tips; they're just a bit too big for my "sleeper" plan... Hence, I'd like pipes of that same quality but a bit smaller.....

Also, if anyone has a system that add's 10-15awhp that sounds good - and looks stock or better - without being "too loud", please let me know..

Thanks for the comments.

[altostratus]

Corsa performance. 3.5" and not obnoxious

[TheBreeze]

I had a CP-E axleback (with the "anti-drone" pipe) on my 135 for about a year. I ended up getting rid of it because I grew tired of the droning at about 60. Much happier with the BMWPE. Granted the e90 is a totally different deal then an e82, but thought I'd share my cp-e experience anyway.

[jwebb335xi]

Originally Posted by TheBreeze

I had a CP-E axleback (with the "anti-drone" pipe) on my 135 for about a year. I ended up getting rid of it because I grew tired of the droning at about 60. Much happier with the BMWPE. Granted the e90 is a totally different deal then an e82, but thought I'd share my cp-e experience anyway.

Thanks for the comments... Nobody else has experience with CP-E exhaust on E90 335...?

Maybe that says something.

[bmwmsport]

In any case you wont gain 25whp from exhaust....

If you do let me know so I can sign up

[jwebb335xi]

Originally Posted by bmwmsport

In any case you wont gain 25whp from exhaust....

If you do let me know so I can sign up

agreed. some of the systems claim 12-15 or so, which gets me darn close...

[bmwmsport]

Originally Posted by jwebb335xi

agreed. some of the systems claim 12-15 or so, which gets me darn close...

Active Autowerke claims the most HP of the ones I've seen I think.

But I'm not willing to shell out $2000 for some pipe. There are other ways to make more HP for much less.