I've searched and searched and havent found a comparison of the 2, I have the GMPP cat-back and manifold I dont like it. The manifold hisses, sounds like an exhaust leak, and the cat-back does not impress me, not to mention I've had to replace the clamps on them because they broke and crimp the pipes.

So I'm considering going to the full Hahn exhaust set-up, i already have the downpipe, but I have never heard the catback in person, only a video on youtube. Has anyone heard both systems? Does the 3" hahn make the car loose big on low-end?

 

HAHN will be LOUD, trust me LOUD!

 

my setup now is pretty loud, gmpp manifold, hahn downpipe, and gmpp cat-back.

Loud is ok as long as its not raspy, does it sound good, or is it more raspy and annoying.

 

I have the gmpp touring and it sounds awesome.I haven't had any problems.I think you will make more power with the Hahn headder.