I'm looking at getting the Apexi WS cat-back exhaust system for my '05 6s. I was wondering if y'all had any idea what i could expect in the ways of power gains, throtle response (if it will help like a CAI will), and how loud it will be. Any info will be apreciated, Thanks!

 

any catback for this car will yield you 0 horsepower gain. its just a sound and cosmetic mod. as far as sound ive never heard the apexi exhaust so i couldnt give you any info on that. Most likely not that loud ill wait for someone to chime in on this.

 

Huh, I had been under the impression that, while the gains wouldn't be big, there would be some, due to the fact that the aftermarket exhaust has a free-er flowing design (same concept as a short ram intake, just on the other side of the engine). Anyways, thanks for taking the time to respond, I apreciate the input.

 

Their wont be any gains at all with the catback. the stock catback is already as free flowing as it can get. Now if you change the headers there will be gains but not with the stock setup.

 

ah, good to know. Thanks for the info!