Reviewed By Peter G (Orchard Park, NY) Reviewed for a 2017 GMC Sierra —9/3/2017 5:53 PM
install took a little longer and a little more difficult than explained but all went well,,,sounds goo an gained a some fuel miles
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.