Flowmaster's new Force II systems for modern diesel trucks bolt on directly behind the DPF for 50-state emissions legality and feature mandrel bent stainless steel piping. The systems are carefully engineered on the vehicles for fitment, performance and mild sound. Some systems feature Outlaw mufflers when some sound control beyond the DPF is needed, while others eliminate the muffler entirely. All systems feature Flowmaster's lifetime limited warranty and all necessary installation hardware.