WCFab L5P Duramax CP3 Conversion Kit

Stock fuel system limiting your L5P's horsepower? In this video, Jason Wehrli discusses how these kits are the perfect solution for engines with bigger turbo kits and injectors that have reached the limits of the stock HP4 injection pump and supporting lift pump but are in search of more power.

***Requires use of an aftermarket low pressure / CP3 compatible lift pump. Not compatible with OEM L5P in-tank pump or high-pressure lift pumps designed for use with HP4 injection pumps.***

Which CP3 pump size option is best for your 2017-2023 6.6L Duramax diesel equipped Chevy Silverado or GMC Sierra truck?

Sportsman (WCF100455)- A great choice for trucks looking to replace a failed HP4 or applications with stock injectors or Exergy 30% over modified units being used with stock or drop in VGT charger setups or our S364.5 or S369 Drop in Fixed Vane Turbo Kits. With proper tuning, this pump will support equivalent power levels to the HP4, up to 750 HP to the wheels.

10mm (WCF100456)- This pump pairs well with our S372, S463, and S467.7 kits with Exergy 60 or 100% over injectors targeting power levels up to 850 HP to the wheels.

12mm (WCF100457)- Works best with our S472 and S476 kits with Exergy 100% over injectors and has been proven to reliably support over 1000 WHP in our regular cab shop truck.

14mm (WCF100458)- Ideal for built competition engines using power adders, big single or custom compound chargers with custom injectors looking to push the limits of the L5P platform.

NOTE: CUSTOM TUNING IS REQUIRED. Not compatible with stock lift pumps or ECM calibrations.

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Wehrli Custom Fabrication Inc. specializes in high-performance diesel upgrades and custom metal fabrication. At WCFab we take great pride in our reputation for providing the highest quality fabricated parts and upgrades for your Duramax, Powerstroke, & Cummins Diesel trucks. Since our beginning we have strived in producing the best products and service on the market, offering turbo kits and custom performance parts on many different levels for your work, play, or competition diesel truck. You can rest assured with the purchase of any of our custom fabricated MADE IN THE USA parts, you will receive the best quality product, fitment, performance, and customer service, before and after the sale. Whether you're looking to outfit your towing rig with our popular S400 over stock compound turbo kit, or if you're looking for four-digital horsepower numbers, we can handle it.

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[HPLP]

Keep it coming man!! Awesome.
Eta on compounds? Say S400 over Duramax tuners soon to be released stealth 67..😎

[xaviergagne]

What's the maximum pressure of the hp4? We know the cp3 won't be able to go over 30k psi (stock r110)

[jeremysharp]

What’s the lift and tire set up on that truck?