2017-2026 L5P Duramax Parts & Performance

2017-2026 L5P Duramax Performance Parts & Upgrades

Maximize the horsepower, torque, and towing capabilities of your late-model GM diesel truck with premium 2017–2026 L5P Duramax performance parts from Full Force Diesel. Representing a massive leap forward in factory power and block design, the 6.6L L5P engine introduced robust cast-aluminum cylinder heads, a class-leading fuel delivery design, and a highly responsive electronically controlled variable-geometry turbocharger. Whether you utilize your Chevy Silverado or GMC Sierra HD as a dedicated heavy-haul tow rig or a high-performance daily driver, targeted aftermarket upgrades can unleash immense power and improve overall engine efficiency.

Optimizing Airflow and Reducing EGTs

The L5P Duramax is a highly efficient air pump, but restrictive factory intake ducting and crushed piping choke its true potential. Upgrading to a high-flow cold air intake system delivers cooler, denser air directly to the turbocharger, which noticeably sharpens throttle response and slashes high exhaust gas temperatures (EGTs). Complete your airflow system with high-velocity intercooler pipes and a larger aftermarket intake horn to reduce backpressure. By pairing these upgrades with a free-flowing turbo downpipe or a premium exhaust system, you will allow the L5P’s advanced turbocharger to spool much faster while maintaining safe engine temperatures under load.

Strengthening Drivetrain and Electronic Control

Equipped with an advanced Denso common-rail fuel system, the L5P’s fuel delivery is incredibly precise. To protect these expensive high-pressure components from fuel starvation and contamination, installing an aftermarket fuel-air separation system or lift pump is highly recommended to continuously supply clean, air-free fuel. Since the L5P platform reacts extremely well to electronic tuning, utilizing a plug-and-play module, inline tuner, or a high-definition digital gauge monitor allows you to safely dial in additional towing power and view critical parameters in real time. Don't forget the transmission—upgrading your Allison automatic with a high-capacity deep aluminum transmission pan and a heavy-duty oil cooler will keep fluid temperatures in check when putting that newly unlocked torque to work.

At Full Force Diesel, we carry everything you need to maintain, protect, and build your late-model GM truck. Explore our L5P 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.