Flowmaster 718155 Flow FX Direct Fit Exhaust Muffler Assembly for Chevy and GMC 6.6

3.5-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability Kit includes complete hardware and factory styled hangers in the stock locations for an easy installation A tuned Flow FX style muffler delivers a deep, aggressive to moderate performance tone and improves exhaust flow with no drone Max increases of up to 7 hp and 5 lb-ft over the stock exhaust at the wheels Tuned performance muffler eliminates interior drone Maintains factory warranty Lifetime Limited Warranty