Your Duramax engine produces high exhaust temperatures and pressure that can eventually cause factory up pipes to fail. Replace your factory driver side up pipe with this direct bolt on replacement driver side up-pipe from PPE. PPE has taken OEM replacement to a new level. This up pipe allows for 53% greater flow over stock and is a direct bolt-on to your factory manifolds. But unlike factory parts, PPE Up-Pipes are manufactured from 11 gauge 304 stainless steel and an internally-sleeved bellow that can take the abuse of high temperature and high pressure. Being this driver side up-pipe increase airflow, it is suggested that both are replaced at the same time. See related products below for the complete kit.