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aFe MACH Force-Xp 3 IN 409 Stainless Steel Cat-Back Exhaust System (49-43015) BODY_COUPE Magnum Flow Pro Dry SMach Force XP 409 SS Cat Back Exhaust System with Single Side Exit (49 43015) by aFe. Exhaust System Type: Cat Back. Exhaust Tubing Material: 409 SS. Main Tubing Diameter: 3". 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