2017-2023 GM 6.6L L5P Duramax CAT/DPF Delete Pipe Stainless Steel Stainless steel 4" Cat & DPF Delete Race Pipe. Requires custom tuning. 2017-2022 GMC Chevy Duramax 6.6L pickup with the L5P engine. Features: -No Bungs. -OE Style Hangers For Easy Installation -Maximum Flow For Competition Applications. off road race product only. Note: This kit will only fit models equipped with the OEM-style 4-bolt flange coming off of the turbo down pipe.