Reviewed By Pete S (Taylorville, IL) Reviewed for a 2011 GMC Sierra —4/26/2017 9:53 AM
I installed this system on my 2011 GMC Sierra and it is fantastic. I have noticed an increase in fuel economy along with that signature Flowmaster performance.
Reviewed By Chad H (Lake Charles, LA) Reviewed for a 2013 GMC Sierra —3/29/2017 4:55 AM
Overall, I am happy with the muffler. As my daily driver and primary family vehicle used for traveling, I didn't want anything too loud. This muffler is a little louder than what I expected, comparing to a 50 series installed on same truck. I removed the 50 series last year and had to go back with the factory muffler due to a drone when pulling my trailer or boat. Using Flowmaster's sound chart, I thought the 70 series would be only choice as it looked to be the quietest muffler Flowmaster makes