The top 5 exhaust brands enthusiasts actually trust for the T1XX (2020-current) GMC Sierra 2500HD/3500HD (Duramax) — ranked by community reputation and fitment reliability.
2020-2026 GMC Sierra 2500HD/3500HD (Duramax) · Exhaust
InstantFetched 2d ago · Refreshes in 58d
Banks Power
Diesel-specific engineering, proven durability, excellent fitment.
Widely available through major performance retailers.
MBRP
Reliable fitment, strong community trust, quality construction.
Widely available through major performance retailers.
Flowmaster
Established diesel reputation, consistent fitment, sound quality.
Widely available through major performance retailers.
Flo~Pro
Duramax-focused design, dependable fitment, enthusiast preferred.
Sold through select diesel retailers and online distributors.
aFe Power
Quality construction, good fitment track record, reliable.
Widely available through major performance retailers.
Adds live pricing, recent forum sentiment, and fitment notes from real-time search.
Curious what to expect? Here's a sample report for VA (2015-2021) Subaru WRX.
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