: Changing mufflers on your CTS-V

vince del
10-16-09, 05:53 PM
I have my new 2009 V now for two weeks and using it as my work vehicle 50K miles plus per year and enjoying it. Most of the roads I travel are open very little stopping. I have heard or read that corsa mufflers claims that just changing the stock mufflers to theirs would increase the MPG as well as the HP by as mush as 16HP. Has any tried this? Thanks.Vince

10-16-09, 06:04 PM
Changing the mufflers won't have an appreciable effect on your gas mileage. However, some muffler manufacturers claim an increase in horsepower. I have the Corsa touring axleback exhaust (mufflers). My automatic puts 471 hp at the wheels after install. I didn't get a pre-mod dyno but automatics typically put down 450-460 whp or so IIRC.

Many threads on this, so you may want to search a little. :thumbsup:

vince del
10-16-09, 06:12 PM
Thanks for the info. Did the sound on your V change much?

10-16-09, 06:14 PM
No drone at 1500 rpm, sounds wonderful at full throttle.

My videos:

YouTube - 2009 CTS-V with Corsa Touring axleback exhaust on dyno

YouTube - 2009 CTS-V stock exhaust vs. Corsa axleback exhaust

Search around on YouTube, there are other exhausts available, too, that you can listen to....Kooks, wait4me, etc...

10-18-09, 02:52 PM
Cold air intake, Long tube headers and hi-flow cats will increase your mileage (and hp), as long as you get it dyno-tuned for that setup.

10-18-09, 06:03 PM
speaking of mufflers, why does it seem mine get so dirty with soot?