Thanks for that spec_black...though I'm curious why do you lose power with a Cannon Exhaust??? Care to elaborate on that one??? Also if I go the cat back, on a 1ZZFE would I get any gains at all??? I've got a Cannon exhaust, I took it out coz, I got caught by the EPA saying that it was too loud. I'm thinking of getting a cat back with the Cannon??? I've already done a custom Air Intake (check out my garage) so maybe a cat back with Cannon would give me some gains. I'm more into Torque than high end power!!! Cheers ← N/A cars need back pressure, and a canon wont give it. Catback system with a propper muffler is the way to go. also i would have a look around for some pipe to replace the peice of stock intake pipe that goes into the intake manifold fromt he short ram intake, try to remove those sharp bends that will also help quite a bit