Already own a 5" DPF back kit? FLO~PRO 5" Turbo Down Cat and DPF Delete pipes will fit up too most 5" DPF back kits on the market. Not a 4" turbo pipe but a true 5". Only O2 sensor bungs are replaced. Airlines and pyromters are removed and not required. FLO~PRO DPF Delete Electronics, H&S XRT tuner or Edge Juice with Attitude Race tuner required for proper operation.