Picking the Best L5P Upgrades for Your Duramax

If you're hunting for the best l5p upgrades to finally wake up your 2017–2023 Duramax, you already know these trucks are solid from the factory but definitely have some untapped potential. The L5P engine brought a lot of improvements over the older LML, like a stronger block and better heads, but GM still left a lot on the table when it comes to throttle response and pure pulling power. Whether you're looking to tow a heavy fifth-wheel without breaking a sweat or you just want that "throw you back in the seat" feeling, there are a few specific parts that actually make a difference. ...

March 1, 2026 · 7 min · Mirian Ortmann