• Sale
  • Regular price $370.26

Many of the Chevy Duramax coolant lines are routed in a way that makes it difficult to upgrade turbochargers or other performance accessories. The HSP Diesel team has developed a solution for many of those issues.

The all new billet thermostat housing and tube kit eliminates the factory coolant hose that crosses over the driver side valve cover. This allows more room for aftermarket turbo systems and fuel components.

You should be running the forward facing thermostat housing kit, with coolant return if you have a stock turbo charger in the valley. This coolant return has a provision to allow coolant to return from the turbo charger. This component is for VGT turbos.

  • 2001-2005 Chevrolet / GMC Billet Thermostat Housing w/ Coolant Return
  • Eliminates The Factory Coolant Hose That Crosses Over Driver Side Valve Cover
  • Allows More Room For Aftermarket Turbos and Fuel Components
  • Made From Billet Aluminum
  • Blood Red Powdercoat Finish
  • Made In The USA
  • Sold As A Kit
  • SKU: 040-HSP-BR


  • 2001-2005 Chevrolet / GMC Truck with Duramax Engine

Compatible With:

  • LB7: 01-04 VIN Code 1
  • LLY: 04.5-05 VIN Code 2

Included Components:

  • HSP Billet upper thermostat housing
  • (1) Thermostat Housing O-ring (719-RFAB)
  • (3) M6 x 1.0 x 35mm Flange Bolts
  • (6) M6 Fender Washers
  • (3) M6 Nylon Lock Nuts
  • (4) M8 x 1.25-25mm Socket Cap Bolt
  • (4) M6 x 1.0-18mm Socket Cap Bolt
  • (1) 1.75 Inch x 3 Inch Straight Boot (437-RFAB)
  • (1) 1.75 Inch x 90 Degree Boot (433-RFAB)
  • (4) 1 3/4 Inch Worm Gear Clamps (408-RFAB)
  • (18 Inch) 3/8 Inch Heater Hose (395-RFAB)
  • (2) 1/2 Inch Heater Hose Clamps (405-RFAB)
  • (1) One Way Check Valve (718-RFAB)


  • CNC machined billet aluminum thermostat upper housing
  • Allows for added room for aftermarket turbochargers
  • Easier access to fuel system components on drivers side valve cover
  • Powdercoat hard tube to improve the look of the engine bay
  • Reinforced silicone boots and hard tube add strength over the factory rubber hose
  • Allows room for dual CP3 pump kits