I just put on an HKS Carbon Ti exhaust. It is my only mod to date. It's only catback,and there seems to be some high end gains, but nothing too exciting. Low end is a little soft now. does anyone have a similar setup, and what are your impressions of the power delivery and driveability after installing this exhaust. I have noticed some wavering in the idle, it will dip down and bounce back up. is this normal? I love the sound, but am looking for some feedback before I decide to sell it for a turbo xs rear section.

Mods to date: K&N filter, HKS Carbon Ti catback exhaust.

 

If pssible, could someone give me some feedback, even if you do not have a similar set up, What kinds of changes should I notice, with this exhaust, sluggish bottom end?, harder pull on top end? smoother pull throught powerband, decreased gas mileage or anything else? Just looking for some help, Thanks!