Just had my local Chevy dealer swap my OE exhaust for the Corsa Touring SS cat back system. I did this as the Corsa instructions call for cutting the OE exhaust to get it off the SS. I wanted to preserve the OE system. The suspension must be partially disassembled if you want the OE set up preserved. The sound is great. Not too loud and Idle seems smoother and off idle throttle response is quite noticeable. Not really sure about power gains but it does sound good and the 4" tip looks good as well. Check out www.corsaperformance.com. They have some sound clips on the web which will let you hear the system. It is pretty close depending on your computer speakers.