Details and Specifications: Vehicle Fitment: This stainless steel 4" Cat & DPF Delete Race Pipe fits the 2015.5-2017 GMC Chevy Duramax 6.6L 2500/3500 pickup with the LML engine. This kit will only fit models equipped with the OEM-style 3-bolt flange coming off of the turbo direct pipe. Race tuning required.. It Will not fit Cab & Chassis trucks. Description: This 4" race pipe allows removal of the catalytic converter and DPF filter from the exhaust system for off-road Features: * 4" stainless steel piping * OE style hangers for easy installation * Maximum flow for competition applications * No bungs