GMC C/K 3500 Performance Mufflers

Reviewed By THOMAS C (GARLAND, TX) Reviewed for a 1985 GMC C/K 3500 —4/4/2013 8:22 PM

One of the best purchases I have made. I went from the 40 series to the 50 series. I am not saying there is anything wrong with the 40 series, as a matter of fact I put a set of them on my 1985 GMC k3500 454 27 years ago. I just changed them out a week ago to the 50 series. Yes the 40s were on their last days, but I would say I got my monies worth. What other muffler that you know of will last 27 years. Needless to say they were a little too loud for me at this point. The 50s fit the bill for me

Reviewed By Robert O (Apple Valley, CA) Reviewed for a 2014 GMC Sierra —6/9/2017 1:07 AM

The only mufflers I buy are these... Mellow at Idle but you when you cut her lose these mags sound amazing, not like those beer can mufflers from Santa Rosa Ca

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