The aFe Mach Force XP Cat-Delete downtube eliminates the use of the restrictive catalytic converter for maximum performance, lower EGTs and extreme mileage gains. This free flowing race pipe outflows the factory exhaust by 67-percent is constructed out of durable 4" mandrel bent 409 stainless steel and uses bayonet style hangers and band clamps for a clean installation. This down tube also has a welded on Urea injector bracket for a clean place to hook up your Urea Injection Tubes. This system requires the use of a controller with a DPF-delete function.