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Mach Force XP Hi-Tuck Cat-Back Exhaust System (49-46223) by aFe. Exhaust Type: Cat-Back. Tubing Diameter: 2.5in. 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 mandrel-bent stainless steel for maximum flow and long-lasting durability. This system begins at the Cat (Catalytic Converter).