Diesel CP4 – CP3 Injection Pump Upgrade Conversion LML For 2011-2016 GM 6.6L Duramax


Diesel CP4 – CP3 Injection Pump Upgrade Conversion LML For 2011-2016 GM 6.6L Duramax


Upgraded Performance CP4 to CP3 Conversion Kit This kit will allow you to upgrade your truck to the far more reliable CP3 and rid yourself of the factory CP4 pump. CP3 injection pumps are higher flowing and performance ones can support upwards of 600hp!** It is highly recommended that you add a lift/supply pump when doing this upgrade, especially if you are also adding a performance fuel pump…DONT STARVE YOUR CP3! The Duramax diesel from the factory is not supplied with a factory lift pump like other truck manufacturers. Upgrading your fuel system is a must in a Duramax! This kit also allows for the removal of your factory fuel filter, further supporting the need for an upgraded fuel supply.   2011-2016 LML Duramax 6.6L Package including: As the picture shown Fitment Guide:
CP3 on CP4 Diesel Injection Pumps Conversion Kit  2011-2016 LML 6.6L Duramax V8 Turbo Diesel
2011-2016 GMC / CHEVY EXPRESS 2500 6.6L
2011-2016 GMC / CHEVY EXPRESS 3500 6.6L
2011-2016 GMC / CHEVY EXPRESS 4500 6.6L
2011-2016 GMC / CHEVY SAVANA 2500 6.6L
2011-2016 GMC / CHEVY SAVANA 3500 6.6L
2011-2016 GMC / CHEVY SAVANA 4500 6.6L
2011-2016 GMC / CHEVY SIERRA / SILVERADO 2500 HD 6.6L
2011-2016 GMC / CHEVY SIERRA / SILVERARO 3500 HD 6.6L

Off-Road Usage Compliance:

The merchandise available on this site is strictly for off-road applications. Adherence to public highway pollution control regulations is mandatory, and many of our products may not conform to such laws.

Local Legislation Awareness:

Prior to purchase and installation, we urge our customers to verify the compatibility of these modifications with local and state regulations. It is essential to ensure that your vehicle remains compliant with area-specific legal standards.

Installation by Professionals Advised:

We strongly advocate for the installation of our kits and components to be conducted by qualified mechanics. Incorrect installation could result in suboptimal performance or potential damage to your vehicle. It should be noted that, barring exceptions listed on specific product pages, our parts are provided without installation guides. Our products are intended for individuals who possess a comprehensive understanding of mechanical systems. Given the universal nature of many aftermarket parts, slight modifications or fine-tuning might be required during installation. We regret that we are unable to process returns or offer refunds due to challenges arising from the absence of installation instructions.

Warranty Notice:

Utilization of these components may invalidate your vehicle’s manufacturer warranty. We recommend consulting with your vehicle’s manufacturer prior to purchase and installation for clarity.

Limitation of Liability: holds no responsibility for any damages or complications resulting from the use of our products. The responsibility for safe and correct usage of our parts lies solely with the user.

Product Representation:

Images displayed on our website are illustrative and may not fully represent the actual product, as manufacturers may implement design changes or improvements.

Performance Outcomes:

While our parts are engineered to boost your vehicle’s performance, specific performance outcomes cannot be guaranteed. The actual performance enhancements may vary depending on several factors.

Welcome to

At, we recognize the critical importance of prompt delivery for your performance parts. Our dedication lies in providing a seamless shipping experience, ensuring that your orders are dispatched with the highest efficiency and speed.

Our Commitment to Fast Shipping:

Our goal is to dispatch all orders within two business days, ensuring rapid and efficient processing. We understand that time is of the essence in receiving your performance parts. However, we also acknowledge that on rare occasions, external factors beyond our control may influence shipping times.

Factors Influencing Shipping Timelines:

  • Weather Conditions: At, we take pride in our swift order processing. However, severe weather conditions such as rain, snow, or sleet could impact delivery times. Rest assured, we are dedicated to overcoming these challenges, striving to minimize any potential delays.
  • Holiday Periods: Our devoted team deserves a break during the holidays, and thus, our shipping center will be closed on these occasions. We assure you that shipping will resume on the next business day. During peak holiday seasons, minor delays might occur, but we commit to keeping you well-informed and working tirelessly to expedite your order.
  • Staff Availability: Our team is our strength, but unforeseen situations can sometimes impact staffing levels. Should this lead to any delays, know that we are actively working to resolve these promptly and maintain our exceptional service standards.

We deeply appreciate your understanding and patience should we face any unforeseen challenges. Be assured, we are fully committed to utilizing all our resources to ensure the prompt delivery of your performance parts.

Choose for Unmatched Service:

Your choice in is a choice for unparalleled customer service driven by our passion. We are here to ensure that your experience with us is as efficient and satisfying as possible.

Thank you for trusting, where our dedication to excellence is fueled by our passion for performance.

Order Cancellation Policy:

Please note that once an order is placed, it is final and cannot be canceled. At, we utilize a network of third-party fulfillment centers, distribution hubs, and manufacturers. Due to the complexity and speed of our logistics, coordinating a cancellation post-order placement is not feasible. We appreciate your understanding and encourage careful consideration before placing your order.

Flexible Return Policy:

We understand that sometimes a product may not be exactly what you needed. For most items, we gladly accept returns within 30 days of receipt. To be eligible for a return, items must be in brand new, resalable condition. Please be aware that customers are responsible for covering the

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