Reviewed By john b (potomac, IL) Reviewed for a 2005 GMC Envoy —3/31/2016 11:37 AM
It brings the 5.3 alive sound wise and gas mileage has improved alittle bit
Reviewed By Joshua M (TOLEDO, OH) Reviewed for a 2009 Pontiac G8 —9/21/2017 7:39 PM
Installed these on my Pontiac G8. The exterior sound is a nice rumble. not too loud, not too quiet.The interior noise "drone" is rather noticable but not too terrible and has a little vibration to it. Again, not terrible. Nothing a little sound dampener cant fix.