MBRP S6059304 4" Armor Pro T304 DPF-Back Exhaust for 20-26 Chevy/GMC Duramax

Vehicle Fitment

• 2020-2026 Chevrolet Silverado 2500HD -- 6.6L Duramax L5P Diesel
• 2020-2026 Chevrolet Silverado 3500HD -- 6.6L Duramax L5P Diesel
• 2020-2026 GMC Sierra 2500HD -- 6.6L Duramax L5P Diesel
• 2020-2026 GMC Sierra 3500HD -- 6.6L Duramax L5P Diesel

Fitment Notes

• 6.6L Duramax diesel ONLY
• Extended Cab and Crew Cab ONLY
• DPF-back (filter-back) -- retains factory DPF/emissions equipment
• Eliminates factory muffler
• Some cutting required during installation
• Aluminized version: S6059AL (3-year warranty)
• T409 SS version: S6059409 (lifetime warranty)
• Black-coated version: S6059BLK (1-year coating / 3-year parts)
• Must register warranty within 30 days of purchase

Features

• Armor Pro (T304 stainless steel) -- MBRP's premier material
• Tour Profile sound -- mild, refined exhaust note
• 4" mandrel-bent tubing for maximum flow
• Up to 70% increased exhaust flow over stock
• Up to 18 HP and 28 lb-ft gains at rear wheels
• Drops EGT by up to 200°F
• Spiral-louvered high-flow muffler
• 5" OD polished T304 SS tip included
• Single side exit (passenger side)
• Bolt-on to OEM hanger locations
• Dyno-proven and road/track tested

Specifications

• Part Number: S6059304
• Series: Armor Pro (formerly Pro Series)
• Type: DPF-back (filter-back)
• Sound Profile: Tour Profile (mild)
• Exit: Single side (passenger)
• Tubing Diameter: 4"
• Tubing Material: T304 stainless steel
• Tip: 5" OD polished T304 SS
• Warranty: Lifetime

Included Components

• DPF-back exhaust system with muffler
• 5" polished T304 stainless steel exhaust tip
• All clamps and mounting hardware
• Installation instructions

Product Description

The MBRP S6059304 is a 4" Armor Pro DPF-back exhaust system in T304 stainless steel for 2020-2026 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax L5P diesel engine. This filter-back system replaces everything from the diesel particulate filter rearward, eliminating the restrictive factory muffler while retaining all emissions equipment. The Tour Profile sound tuning delivers a refined, mild exhaust note -- noticeable performance character without aggressive volume. The 4" mandrel-bent T304 stainless steel tubing increases exhaust flow up to 70% over stock, reducing EGTs by up to 200°F while delivering up to 18 HP and 28 lb-ft of additional torque at the rear wheels.

MBRP's Armor Pro line represents their premier material tier -- T304 stainless steel cannot rust and is the ideal choice for trucks operating in snow, salt, and severe environments. The system exits behind the passenger-side rear tire with an included 5" polished T304 stainless steel tip stamped with the MBRP logo. Installation is bolt-on to factory hanger locations and takes approximately 1.5-2 hours, though some cutting is required per the installation instructions. Fits Extended Cab and Crew Cab configurations. For a more budget-friendly option, the aluminized Armor Lite version is available as S6059AL. Lifetime MBRP warranty -- must be registered within 30 days of purchase.