2020-2026 GMC Sierra 3500 HD AT4 Denali SLE SLT Base Pro : 401 & Cylinder: 8 & Block: V & Fuel: GAS) – IntakeAuthority.com

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SKU: 717927

Chevrolet, GMC (6.6) Exhaust System Kit
- Max dyno gains of 11 hp and 10 lb-ft at the rear wheels for stronger acceleration and towing
- 409 stainless steel construction with a straight-through Flow FX muffler for aggressive sound and no drone
- Fits 2020-2026 GM 2500HD/3500HD 6.6L gas trucks in both 2WD and 4WD
- Uses all factory hangers and connections for a simple, cut-free at-home install
- CARB (California) compliant and backed by Flowmaster’s Lifetime Limited Warranty
- Includes installation instructions and all necessary hardware
$763.72
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SKU: 718155

Chevrolet, GMC (6.6) Exhaust Muffler Assembly
- Adds max dyno gains of 7 hp and 5 lb-ft at the rear wheels for better acceleration and towing
- Full 409 stainless steel construction resists corrosion for years of trouble-free performance
- Straight-through Flow FX absorption muffler delivers an aggressive tone with no interior drone
- Direct-fit design uses factory hangers and connections for easy DIY installation
- Includes flat band clamps, hardware, and instructions; backed by Flowmaster’s Lifetime Limited Warranty
- Fits both 2WD and 4WD 2020-2026 GM 2500HD/3500HD trucks with the 6.6L gas engine
$433.77
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