I have the Cobb turbo back and it rocks. I have an 05 and I was worried about how the tip was going to look since the 05 has the 4 inch tapered angled down tip that looks amazing. after I installed the turbo back I realized it looks better. it is slightly smaller a few millimeters. and the sound I thought was too loud, until I had a friend drive it while I stood out side to listen. The sound is rocking and the performance is even better.