2020-2026 L5P Duramax

The 2020–2026 L5P Duramax represents the most advanced generation of GM’s 6.6L diesel, featuring refined electronics, improved air management, and class-leading towing capability. Found in Silverado and Sierra HD trucks, this powerhouse delivers unmatched durability and performance for both work and play. Thoroughbred Diesel offers everything from maintenance kits and tuners to turbo upgrades and fueling components to keep your L5P operating at peak performance.

Our catalog of 2020–2026 L5P Duramax parts includes everything from OEM-quality maintenance items to top-tier performance upgrades. Popular products include cold air intakes from S&B and AFE, exhaust systems from MBRP and Banks, Edge Insight monitoring systems, and tuning solutions from HP Tuners and Bully Dog for those seeking maximum control. Many owners also turn to PPE and ATS transmission upgrades, Fleece Performance turbo components, and lift pumps from AirDog to enhance reliability and towing power. We also carry complete gasket kits, filters, sensors, and cooling system parts to keep your L5P running like new.

Whether your Silverado or Sierra HD is a daily workhorse, a towing rig, or a performance build, Thoroughbred Diesel has the brands, parts, and experience to help you get the most out of your 6.6L L5P Duramax. Browse by department, shop trusted brands, or explore featured upgrades below — everything you need for your 2020–2026 Duramax is right here.

L5P Duramax Injectors, Fuel System, Turbo & Performance Upgrades

The 2020–2026 GM 6.6L L5P Duramax sets a new benchmark for diesel power in modern heavy-duty trucks. Found in the Chevrolet Silverado HD and GMC Sierra HD, this generation of Duramax delivers exceptional horsepower, torque, and towing capability right from the factory. With advanced fuel injection, improved cooling, and a stronger Allison transmission pairing, the L5P is built to handle the toughest jobs while maintaining smooth daily drivability. Thoroughbred Diesel offers a full selection of 6.6L L5P Duramax parts to help you maintain, upgrade, and unleash the true potential of your GM HD truck.

• Edge Insight CTS3 (84130-3) & Edge EGT Probe with Lead (98620)
• Edge Insight CTS3 Digital Gauge Touchscreen Monitor
• Edge EAS EGT Kit (Daily Driver/Tow Kit) - 98620
• Alliant Power DCR Conversion Pump - 2017-2023 GM Duramax L5P
• G&R Diesel Billet Aluminum Bottom Sump w/ Integrated Fuel Return System - Universal
• WC Fab GM Billet Heater Core Fitting Kit With Hose
• PPE OEM Length Replacement High Flow Up-Pipes - 17-26 Duramax L5P
• FASS Drop In Series Fuel System - 2020-2025 Duramax L5P (Crew Cab, Short Bed)
• Alliant Power Remanufactured L5P Common Rail Injector Bank Kit - 17-22 Duramax L5P
• Fleece Cheetah Turbo - 17-23 GM Duramax L5P
• Beans Diesel-Bean Machine Multi Function Fuel Tank Sump Kit
• Alliant Power Fuel Contamination Kit - 20-23 GM Duramax L5P
• ARP Head Stud kit - 17-24 GM Duramax 6.6L L5P (ARP 2000 Material) - 230-4301
• FASS Drop In Series Fuel System - 2017-2019 GM Duramax L5P 2500HD/3500HD (Crew Cab, Short Bed) | 2017-2024 GM Duramax L5P 2500HD/3500HD (Crew Cab, Long Bed)
• Banks Pedal Monster Kit, Molex MX64, 6 Way, Stand Alone, For Use With Phone
• S&B Filters Map Sensor Spacer Kit - 2017-2025 Duramax L5P
• FASS No Drop Series Fuel System for 2020-2023 GM/Chevy Duramax 6.6L (Stock-500hp)
• FASS Titanium Signature Series (180F/140gph/70-75psi) - 20-23 (Tuned Duramax L5P)
• FASS No Drop Series Fuel System for 2020-2023 GM/Chevy Duramax 6.6L (900-1200hp)
• FASS No-Drop Plus Series 240GPH - 2020-2023 GM/Chevy Duramax 6.6L
• WC Fab Replacement 4" Inlet Dry Air Filter
• FASS No Drop Series Fuel System for 2020-2023 GM/Chevy Duramax 6.6L (500-900hp)
• MBRP 4" Quiet Tone Muffler Resonator - Construction: Aluminized - Universal
• FASS Titanium Signature Series (250F/220gph/70-75psi) - 20-23 (Tuned Duramax L5P)