2017+ L5P DURAMAX SPORTSMAN CP3 CONVERSION KIT

The Wehrli WCF100455 is a CP3 Conversion Kit with an Exergy Sportsman CP3 pump. This kit is designed to replace the factory HP4 pump in 2017-2026 GM 6.6L Duramax L5P engines, offering a more reliable and performance-focused fueling solution. It is suitable for trucks with stock injectors or mild upgrades (such as Exergy 30% over units) and can support up to 750 rear-wheel horsepower with proper tuning. The kit includes a black anodized billet aluminum CP3 pump mount plate, a high-pressure fuel line, high-pressure rail fitting, stainless barb fitting, and all necessary hardware and clamps for installation. It requires an aftermarket low-pressure lift pump (15-20 PSI) and is not compatible with the OEM L5P in-tank pump or high-pressure lift pumps designed for HP4 injection pumps. Custom tuning is essential for optimal performance.