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The Gibson Dual Extreme cat-back for 2004–2008 Ford F-150 STX 4.6L is an aluminized bolt-on exhaust positioned behind the rear tires for aggressive styling and a powerful exhaust note. Dyno-tested for street performance, it typically provides 15–20 horsepower gains and a mean muffler tone from the Superflow design. Polished stainless slash-cut tips and included hardware simplify installation without welding; the system is backed by a Lifetime Limited Warranty.
Gibson 04-08 Ford F-150 STX 4.6L 2.5in Cat-Back Dual Extreme Exhaust - Aluminized
