2020-2026 GMC Sierra 3500HD CatBack Exhausts

Catback exhaust systems engineered for the 2020-2026 GMC Sierra 3500HD with the 6.6L L8T gas V8 and 6.6L Duramax diesel. Stocking MBRP, Flowmaster, Borla, MagnaFlow, and AFE in single-side, dual-side, and behind-tire exits with 304 stainless and aluminized options.

Will a catback exhaust trigger a check engine light or affect emissions? No. Catback systems install behind the catalytic converter, so factory emissions hardware stays intact and no CEL is triggered on the L8T or Duramax.

Verified fitment for your Sierra 3500HD, no guesswork.