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The Gibson dual extreme cat-back exhaust for 2008–2010 Hummer H3 Alpha 5.3L is a stainless bolt-on system engineered for extreme sound and presence. Exiting behind the rear tires at an aggressive angle, it’s dyno-tested to yield average gains of 15–20 hp and pairs a mean-sounding Superflow CFT muffler with polished stainless tips. Includes stainless mandrel-bent tubing, clamp-on tips, all hardware and a lifetime limited warranty for long-term confidence.
Gibson 08-10 Hummer H3 Alpha 5.3L 2.5in Cat-Back Dual Extreme Exhaust - Stainless
