Cooling
Fleece Multiuse Sensor Pigtail (FPE-HAR-MU-PT-5) for 2001-2022 Duramax LB7 / LLY / LBZ / LMM / LML / L5P & 1994-2022 Cummins 5.9L / 6.7L
The Fleece Multiuse Sensor Pigtail (FPE-HAR-MU-PT-5) is a durable, weatherproof wiring solution compatible with 2001–2022 Duramax and 1994–2022 Cummins diesel engines. Featuring OEM-style connectors, it serves as a reliable replacement or upgrade for various sensor connections, ideal for both repairs and custom builds.
Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) for 2001-2016 Duramax LB7 / LLY / LBZ / LML
The Fleece Oil Cooler Adapter O-ring Kit (FPE-DMAX-OCADPT-ORING-KIT) is a durable, OEM-compatible replacement kit by Fleece Performance Engineering, designed for 2001–2016 GM Duramax diesel engines (LB7, LLY, LBZ, LML). It includes all necessary O-rings to reseal the oil cooler adapter, helping prevent oil leaks and maintain engine performance—ideal for routine maintenance or oil cooler servicing.
Sinister Diesel Radiator Pipe (SDRADTUBEDMAX11) for 2011-2016 Duramax 6.6L LML
This 11-16 Duramax 6.6L radiator pipe kit replaces factory coolant hoses that are prone to cracking and abrasions, ensuring long-term reliability. Made from durable 6061 aluminum with a precision mandrel bend for a perfect fit, it provides extra protection against wear and cooling system failures.
Sinister Diesel Coolant Filtration System w /Wix (SDLMLCF11) for 2011-2016 Duramax 6.6L LML
This Coolant Filter Bypass System helps extend the life of your diesel engine by removing contaminants like casting sand and metal shavings, protecting components such as the water pump, EGR cooler, and oil cooler. It filters small amounts of coolant while the engine runs and features a durable CNC-machined aluminum filter block that mounts without drilling.
Sinister Diesel Degas Bottle (SDDEGASLML13) for 2013-2015 Duramax 6.6L
Upgrade your 2013-15 Duramax 6.6L with Sinister Diesel’s high-strength, all-aluminum coolant reservoir. Made from 6061 aircraft-grade aluminum, TIG welded, and pressure tested, it enhances durability and heat dissipation for better performance and longevity. This direct drop-in replacement requires no modifications and installs in under 30 minutes with basic tools.
Sinister Diesel Coolant Reservoir (Degas) Cap (SDDCDMAX01) for 2001-2016 Duramax 6.6L
The Sinister Diesel Coolant Reservoir Cap is a factory-style replacement with a custom design. Made from CNC-machined T6-6061 aluminum, it fits OEM and Sinister Diesel reservoirs for 2001-2016 GM Duramax models. It includes an internal pressure relief system for reliability, even if the gasket fails. Available in gray or Sinister Blue, it combines durability with a stylish look.
Sinister Diesel Coolant Filtration System (w/ WIX) (SDCOOLFIL6611W) for 2011-2015 Duramax 6.6L LML
This Coolant Filter Bypass System extends the life of your diesel engine by removing contaminants like casting sand and metal shavings, protecting the water pump, EGR cooler, and oil cooler. It filters small amounts of coolant while the engine runs. The CNC-machined aluminum filter block mounts using factory holes, requiring no drilling. The kit includes all necessary fittings, and the filter is easy to replace.
Fleece Oil Cooler Adapter (FPE-DMAX-OCADPT) for 2001-2016 Duramax LB7 / LLY / LBZ / LML
The Fleece Performance FPE-DMAX-OCADPT Oil Cooler Adapter is a durable aftermarket upgrade for 2001–2016 GM Duramax diesel engines (LB7, LLY, LBZ, LML). Designed for a direct fit, it improves engine oil cooling for better temperature control under heavy loads or performance use. Ideal for enhancing engine reliability and longevity, it offers a secure, leak-free connection and easy installation for professionals or experienced DIYers.
Mishimoto Transmission Cooler (MMTC-DMAX-15SL) fits 2015-2016 Duramax LML 6.6L
The Mishimoto Transmission Cooler (MMTC-DMAX-15SL) is a high-quality aftermarket upgrade designed specifically for 2015-2016 Duramax LML 6.6L engines. This transmission cooler is an ideal solution for those looking to improve the performance and reliability of their vehicle’s transmission system.
Mishimoto Water Temperature Sensor Adapter – 32mm (MMWHS-32-BK)
The Mishimoto Water Temperature Sensor Adapter 32mm (MMWHS-32-BK) is a high-quality and versatile component that allows for easy installation of aftermarket water temperature sensors in a variety of vehicles. This adapter is designed to fit onto a 32mm coolant hose and provides a secure and leak-free connection for the sensor.
BD Diesel Xtruded Double-Stacked Auxiliary Trans Cooler Kit 1/2 In Tube (1030606-DS-12) for 1994-2016 Cummins 5.9L / 6.7L & 2001-2016 Duramax LB7 / LLY / LBZ / LMM / LML
The BD Diesel Xtruded Double-Stacked Auxiliary Trans Cooler Kit (1030606-DS-12) is a heavy-duty transmission cooling upgrade for 1994–2016 Cummins and 2001–2016 Duramax diesel engines. Made from durable aluminum with 1/2-inch tubing, its double-stacked, extruded design enhances heat dissipation and airflow, lowering transmission temperatures—especially during towing or hauling. Ideal for diesel truck owners seeking better performance and transmission durability in demanding conditions.
AEM Water Temp Sensor Kit,30-2012, 1/8 in. NPT
The AEM Water Temp Sensor Kit,30-2012, 1/8 in. NPT is a high-quality and reliable product designed to accurately measure the temperature of your vehicle’s coolant system. This kit includes a 1/8 inch NPT sensor, which is a common size used in many vehicles. It also comes with a connector and wiring harness for easy installation. With this sensor kit, you can monitor the temperature of your engine and ensure that it stays within a safe operating range. This is especially important for high-performance vehicles or those used in extreme conditions. The AEM Water Temp Sensor Kit is a must-have for any car enthusiast looking to keep their engine running at its best.
Sinister Diesel “Welded” Water Pump (SDWWP06) for 2006-2016 Duramax LBZ / LMM / LML
Proper cooling is essential for reliable performance in modified engines. The factory Duramax water pump can slip under load, leading to serious issues in high-horsepower setups. The Sinister Diesel Welded Duramax Water Pump is a drop-in replacement featuring TIG-welded pump gear for improved durability. It’s ideal for 2006–2016 Duramax trucks with performance upgrades or those needing maintenance.
MMRA-LC
Mishimoto Low Temperature Thermostats – set of 2 (MMTS-CHV-01DL) fits 2001-2016 Duramax 6.6L
The Mishimoto Low Temperature Thermostats are a must-have upgrade for any 2001-2016 Duramax 6.6L owner looking to improve their engine’s performance and longevity. This set of two thermostats, part number MMTS-CHV-01DL, is specifically designed to fit perfectly in your Duramax engine and provide superior cooling capabilities.
MMRA-LC-5050F
Mishimoto High Temperature Thermostats – set of 2 (MMTS-CHV-01DH) fits 2001-2016 Duramax 6.6L
The Mishimoto High Temperature Thermostats are a must-have upgrade for any 2001-2016 Duramax 6.6L owner looking to improve the performance and reliability of their engine. These thermostats are specifically designed to withstand high temperatures, making them the perfect choice for diesel engines that are known to run hot.
