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The system includes jetting from 35 to 150 horsepower and can be upgraded to 250 horsepower with additional jets
tuned and dyno-tested to fit specific GMC Sierra 2500/3500 HD and Chevrolet Silverado 2500/3500 HD models
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Rear Diffuser by APR Performance
aFe MACH Force-Xp 4 IN 409 Stainless Steel Cat-Back Exhaust System w/ Black Tip (49-42056-B) 8021 The system includes jetting fromMach Force XP 409 SS Cat Back Exhaust System with Single Side Exit (49 42056 B) by aFe. Exhaust System Type: Cat Back. Exhaust Tubing Material: 409 SS. Main Tubing Diameter: 4". Exhaust System Sound: Aggressive Loud. Get increased exhaust flow, more horsepower and torque, improved performance and lower exhaust gas temperatures with the aFe Mach Force XP Cat Back Exhaust System. aFe dyno tests every system for maximum gains, and constructs them from