Improve the exhaust flow of your 2017-2022 L5P Duramax with WCFAB's 3.5" down pipe, replacing the restrictive, crushed factory part. WCFAB's L5P downpipe features a ceramic coating and is covered with heat wrap. WCFAB's downpipe includes a sensor bung. No turning required. Works on emissions-compliant trucks. Connects to the DOC (Diesel Oxidation Catalyst) outlet flange and mates with the OEM exhaust system front pipe with the 4 bolt style flange connection. For best results, combine WCFAB's dow
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