Flowmaster’s new FlowFX cat-back exhaust system for 2011-2019 GM 2500HD/3500HD trucks with the 6.0L V8 features 3.5-inch mandrel-bent pipes and a FlowFX “straight-through” muffler for a moderate sound level with maximum performance. The system is built using 409 stainless steel throughout and has shown increases of up to 21 horsepower and 23 ft-lbs of torque during dyno testing. The system exits out the side, behind the rear wheel, with a 5-inch black ceramic tip for a custom look. This system u