Reviewed By jeffrey b (LAKE PLACID, FL) Reviewed for a 2008 Chevy Silverado —9/27/2016 5:28 PM
nice headers easy to install did not notice much difference in horse power or gas mileage I thought I would notice sum difference in power and mileage
Reviewed By Jgru K (Flanders, NJ) Reviewed for a 2004 Chevy Silverado —3/14/2015 5:47 AM
Great replacement for stock cats. Noticed significant increase in power and good sound with Flowmaster muffler . No problem with codes from o2 sensors with new parts. A lot less expensive then stock factory parts.
Reviewed By LANDON J (Littleton, CO) Reviewed for a 2007 Chevy Silverado —2/15/2014 6:56 PM
I have ran Flowmaster Mufflers for years and I love the sound of the Original 40 Series. The sound of the Original 40 Series Mufflers are a very aggressive tough sound that echoes the sound of performance.