This Flowmaster Flow FX cat-back exhaust system for the 2020-2025 GM 2500HD/3500HD trucks with the 6.6-liter gas engine is manufactured using durable 409 stainless steel throughout.
It features 3.50 to dual 3.00-inch mandrel bent pipes for better exhaust gas flow, and a Flow FX 'straight-through' muffler is used for a moderate sound level and maximum performance.
Maximum increases on the dyno revealed +9 hp and +10 lb-ft at the rear wheels.
The system exits out both sides, behind the rear wheels with 4.50-inch black ceramic tips for added style and a custom look.
It uses all the existing factory hanger locations and includes installation instructions and all necessary hardware for an easy installation that you can do at home.
Backed by Flowmaster's Lifetime Limited Warranty.
Fits 2020-2025 GM 2500HD/3500HD trucks with 6.6-liter gas engines.
Fits 2 & 4-wheel drive, Crew Cab with 6.5-foot bed only.
Does not fit 5th wheel towing packages.
Does not fit ZR2 and AT4X packages.
