aFe 49-44071-B MACH Force-Xp 3 IN 409 Stainless Steel Cat-Back Exhaust SystemaFe 49 44071 B MACH Force Xp 3 IN 409 Stainless Steel Cat Back Exhaust System Test Results: In testing, the cat back exhaust system resulted in gains up to + 14 horsepower and + 17 lbs. x ft. of torque, as measured on aFe Powers in house dyno (tested on 2014 Chevrolet Silverado V8 5. 3L)aFe power introduces the MACH Force Xp cat back dual exhaust system for the 2009 2019 Chevrolet Silverado GMC Sierra 1500 with V6 4. 3L & V8 4. 8L 5. 3L engine. This
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aFe 49-44071-B MACH Force-Xp 3 IN 409 Stainless Steel Cat-Back Exhaust System