Reviewed By Dennis S (RAYNHAM, MA) Reviewed for a 2016 GMC Sierra —10/4/2016 3:19 AM
It's a must have
Reviewed By thomas f (BOONESMILL, VA) Reviewed for a 2005 GMC Sierra —3/17/2016 4:26 AM
Simple install, has that typical whistle between 2,500 and 4,000 rpm. Note: didn't whistle at 1st but did after I seafoamed my truck to improve performance. Definitely pulls hills better. No need for the expensive metal ones.