2011-2016 LML Duramax Parts & Performance

2011-2016 LML Duramax Performance Parts & Upgrades

Maximize the towing power, throttle response, and overall drivetrain reliability of your GM diesel with premium 2011–2016 LML Duramax performance parts from Full Force Diesel. Representing a major leap forward in frame strength, braking, and factory horsepower, the 6.6L LML Duramax introduced a highly advanced piezo-controlled injection system and a beefier Allison transmission. While this platform makes an exceptional heavy-duty workhorse, targeted upgrades to its fueling infrastructure and airflow are critical to protecting your investment and unlocking maximum performance.

Critical Fuel System Protection & CP4 Upgrades

The single most important upgrade for any LML Duramax revolves around the factory Bosch CP4.2 high-pressure fuel pump. Due to its sensitivity to fuel starvation and poor fuel lubrication, a CP4 failure can send metal debris through the entire high-pressure fuel system, costing thousands in damage. To prevent this, installing an aftermarket CP4 disaster prevention (bypass) kit is highly recommended to redirect debris away from your expensive injectors. For ultimate peace of mind, many owners opt for a CP3 fuel pump conversion. To support these setups and continuously feed your pump with clean, air-free fuel, adding a FASS or AirDog fuel-air separation system is the gold standard in preventative maintenance.

Optimizing Airflow and Allison Transmission Performance

To help your LML breathe easier and reduce exhaust gas temperatures (EGTs) under heavy loads, addressing factory exhaust and intake restrictions is key. Replacing the restrictive factory turbo downpipe with a smooth, mandrel-bent 3-inch downpipe drastically improves exhaust velocity right out of the turbocharger. Combine your exhaust upgrades with a high-flow cold air intake system and upgraded intercooler pipes to deliver a steady stream of cold, dense air to the engine. Because the LML can easily be tuned to generate massive torque, upgrading your Allison transmission with heavy-duty oil coolers, a deep pan, or an upgraded torque converter will ensure your drivetrain can handle the extra work.

At Full Force Diesel, we carry everything you need to maintain, protect, and build your 2011–2016 GM truck. Explore our LML subcategories above to discover high-performance turbochargers, heavy-duty steering and suspension upgrades, digital gauge monitors, and custom programmers from the industry's most trusted manufacturers.