GMC Performance Exhaust Systems

Reviewed By J (Johnson, KS) Reviewed for a 2017 GMC Sierra —4/10/2018 8:35 PM

This system is insane! It looks great, and the sound is like no other cat-back I've heard. The cold-start is VERY loud (which my neighbors probably hate), and the burble in downshifts is very addictive. I did have to use a tuner to switch off cylinder deactivation as it made an obnoxious noise which you don't normally notice. Highly recommended!

Reviewed By David W (Aptos, CA) Reviewed for a 2000 GMC Sierra —4/9/2018 5:30 PM

Great improvement over factory exhaust, gives a nice rumble to my once silent truck with no increased noise in the cab.

Reviewed By Robert V (MOUNT MORRIS, MI) Reviewed for a 2009 GMC Sierra —3/27/2018 2:26 PM

Very happy with thr outlaw system from flowmaster. Had it installed at a local muffler shop and had them weld it up to insure no exhaust leaks. Sounds killer and would recommend it to anyone looking for a good exhaust system. Its not too loud in the cab either like I thought it would be. Its perfect!