Header and DP Questions
 

Hello,

I just bought a ZZP Mid length header and Downpipe combo for my 07 G5 GT. Saying that, i have a GMPP 2.5" Cat back exhaust i have had on for about 2500-3000k. Now saying that does anyone have any idea on what i might expect for power gains, responsiveness, and sound? I made sure that it came with the 200 cell Cat on the DP. My car is just a regular 2.4L with nothing done so far.

8-10hp perhaps? I saw much better high end gains with an ebay long tube header set then I did the zzp mid length header, and the zzp mid length had terrible issues with port matching to the exhaust side which hurt performance even more.