Product Description
Industrial Injection 438402 GM Dual CP3 Kit – 2006–2010 6.6L Duramax LBZ/LMM
Unlock rock-solid rail pressure and headroom for bigger injectors and higher horsepower on your 2006–2010 GM 6.6L Duramax. The Industrial Injection 438402 Dual CP3 Kit adds a second CP3 pump to your factory system for dramatically improved fueling, smoother power delivery, and reduced pressure drop at wide-open throttle. Designed to integrate cleanly under the hood with OE-style brackets and lines, this kit is a proven upgrade for street/strip trucks, tow rigs, and competition builds.
Why This Kit
- Consistent rail pressure at high load/high RPM to support larger injectors and turbo upgrades.
- Clean installation with model-specific brackets, high-pressure lines, and hardware.
- Scalable fueling without overworking the stock pump, improving reliability.
Fitment
- Chevrolet Silverado 2500HD/3500HD — 2006–2010 — 6.6L Duramax LBZ (2006–2007.5) / LMM (2007.5–2010)
- GMC Sierra 2500HD/3500HD — 2006–2010 — 6.6L Duramax LBZ / LMM
Shop related categories: Duramax Parts • Industrial Injection • Fuel System • Dual CP3 Kits
What’s Included
- Primary/auxiliary CP3 mounting bracketry & hardware
- Model-specific high-pressure line(s) and fittings
- Drive components (as required by application)
- Installation instructions
Note: CP3 pump(s) are sold separately unless otherwise stated. See recommended parts below.
Installation & Tuning Notes
- Professional installation recommended. Verify line routing and clearance.
- Custom tuning is recommended to fully realize gains and maintain commanded rail pressure.
- Pair with sufficient air (turbo/charger) to match added fuel capacity.
Recommended Parts (Internal Links)
- CP3 Pumps (LBZ/LMM) – choose stock or performance-modified.
- High-Pressure Fuel Lines & Fittings – replacements and upgrades.
- Tuners & Controllers – support dual fueler calibrations.
- Turbo Upgrades for LBZ/LMM – balance air with added fuel.
- Drive Belts & Pulleys – service components during install.
FAQ
- Do I need tuning for a Dual CP3?
- Yes, proper calibration helps maintain commanded rail pressure and avoids over-fueling. See Tuners.
- Will this help towing?
- Maintaining rail pressure under sustained load can improve throttle response and reduce EGT when paired with correct air and tuning.
- Is any cutting required?
- This is a bolt-on kit designed for LBZ/LMM engine bays. Minor routing adjustments may be required depending on other mods.
- Does the kit include a second CP3 pump?
- Typically the pump is not included. Add a compatible unit from our CP3 Pumps category.
Specifications
| Brand | Industrial Injection |
|---|---|
| Manufacturer Part # | 438402 |
| Vehicle Fitment | 2006–2010 GM 6.6L Duramax LBZ/LMM (Silverado/Sierra 2500HD/3500HD) |
| System Type | Dual CP3 (adds auxiliary pump to factory CP3) |
| UPC | Refer to manufacturer / TBD |
| GTIN | Refer to manufacturer / TBD |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
Disclaimers
For off-road/competition use where applicable. Ensure compliance with local, state, and federal regulations. Professional installation and post-install inspection recommended.
