I have Kooks to the Varex catback. I wish I had the Xforce headers just to make it bolt on, but I already had the Kooks.
The catback did take a while to break in. It was a very deep, smooth tone at first. Now it screams above 3k rpm. Come spring, I'm going to remove the small cats that I have, we'll see how that does for sound.
2009 PBM GT
Under the Knife Again
Wiseco Pistons, K1 Rods, Johnson Lifters, BLP Keep Hatin' PDS Cam, Roto-Fab, BLP Ported Intake and Throttle Body, Kooks 1-7/8 long tubes, XForce Varex Catback, ZL1 Converter, Camaro Trans Pan/Filter, GXP Brembos
Breyton GTS-AV Wheels, 6k HIDs, Holden Steering Wheel and Paddle Shifters, Eibach Springs, 35% Tint
Tuned by Day Tuning