**Shipping Notice:**

Due to high order volumes, most HSP products are expected to ship within 2-8 weeks from the date of purchase. For a more accurate lead time, please contact us directly.

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**HSP Billet Thermostat Housing Kit (040-HSP) for 2001-2005 Chevrolet and GMC Duramax**

The HSP Billet Thermostat Housing Kit is a top-notch piece of billet equipment designed for Duramax-powered Chevrolet and GMC trucks.

**Why Choose the HSP Billet Thermostat Housing Kit?**

The factory setup in Duramax engines can be quite cramped, especially when switching to a different valley-based turbo without cooling provisions. The HSP Billet Thermostat Housing Kit addresses this issue by providing more space for aftermarket turbo systems and fuel components.

**Key Features:**

- **Billet Thermostat Housing and Tube:** Eliminates the factory coolant hose that crosses over the driver's side valve cover, creating more room for twin-turbo systems and dual CP3 kits.
- **Enhanced Accessibility:** Easier access to fuel system components on the driver's side valve cover.
- **Improved Engine Bay Appearance:** Powder-coated hard tube for a sleek look.
- **Multiple Color Options:** Available in various colors and custom options.

**Kit Contents:**

- (1) Thermostat Housing O-Ring
- (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 Bolts
- (4) M6 x 1.0-18mm Socket Cap Bolts
- (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)

**Special Note:**

HSP Diesel is currently making a running change in boot style, which means you may receive boots without logos. This change ensures we can continue providing high-quality parts.

**Compatibility:**

- **LB7:** 01-04 (VIN Code 1)
- **LLY:** 04.5-05 (VIN Code 2)

To identify the VIN code, check the 8th character of the VIN number. The 10th character indicates the year of the truck.

**Overview:**

- CNC Machined Billet Aluminum Thermostat Upper Housing
- Allows for added room for aftermarket turbochargers
- Easier access to fuel system components on the driver's side valve cover
- Powder-coated hard tube to improve the look of the engine bay
- Allows room for dual CP3 pump kits
- Multiple color options and custom options available
- Makes room for unique and high-powered turbo setups

**Our Warranty:** HSP No BS Limited Lifetime Warranty