aFe 3in SS Cat-Back Exhaust w/ Dual Tips | RAM 1500 V8-5.7L (19) (49-42059-B)Mach Force XP 409 SS Cat Back Exhaust System with Split Rear Exit (49 42059 B) 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