Flowmaster 17398 Cat-back System - Dual Same Side Exit - American Thunder - Aggressive Sound Mandrel bent 16 Gauge Tubing Aggressive Sound Exterior Exhaust Tone Includes hangers and hardware for easy installation Dyno Tuned For Maximum Performance Fits 2004 to 2005 Dodge Ram 1/2 Ton truck with a 5.7L Hemi Magnum engine, fits 2 wheel drive models only with either Crew Cab and short bed or Standard Cab and long bed configuration on a 140 inch wheelbase.