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The aFe Apollo GT 4" cat-back exhaust for 2020–2023 GM 2500/3500HD V8 6.6L (L8T) is a direct bolt-on stainless system built from 4" mandrel-bent 409 stainless tubing. It includes a high-flow 409 SS muffler and a polished 5" clamp-on tip with an aFe POWER logo plate. Factory-style flanges and hangers, 100% MIG welds, and included hardware make installation straightforward while delivering a deeper exhaust tone.
aFe 20-23 GM 2500/3500HD V8 6.6L L8T Apollo GT Series 4in 409 SS Cat-Back Exhaust System
