GM Truck SUV Engine Coolant Expansion Tank Reservoir | Fits 99-07 GMT800/820/830 Trucks & SUVs

Straightboost® Coolant Expansion Reservoir Tank

Fits 1999–2007 GM Truck and SUV (Silverado, Sierra, Tahoe, Suburban, Avalanche)

One of the most complete and well-engineered coolant expansion tanks available on the market, designed specifically for high-performance GM truck & SUV builds.

At Straightboost® Performance, we are committed to developing purpose-built components for the automotive performance community. We are proud to offer this custom coolant expansion tank, engineered for 1999–2007 Chevrolet Silverado and GM trucks that require improved durability, clearance, and performance over the factory plastic tank.

Whether you’re replacing the OEM tank for aesthetics, reliability, or turbo clearance, this all-aluminum solution delivers increased longevity and superior heat resistance compared to the factory unit.

Vehicle Fitment

• Designed for 1999–2007 GM Truck and SUV (Silverado, Sierra, Tahoe, Suburban, Avalanche)

• Optimized to allow turbo installations without clearance or overheating issues

• May fit other GM vehicles using the same factory-style plastic expansion tank
  (Please contact us if you are unsure about compatibility)

Features:

• Direct replacement

• Compatible with turbo and non-turbo applications

• Works with OEM coolant hoses

• Will not fit with OEM airbox

• No coolant level sensor port

Specifications:

• Brand: Straightboost® Performance

• Material: High-grade Aluminum

• Finish: Natural Aluminum (optional powder-coated finish available)

• Capacity: 4.25 Liters / 1.12 US Gallons (recommended fill: 65%)

• Construction: Fully TIG Welded for strength and longevity

• Billet Aluminum Radiator Cap Options:

  • 16 PSI (OEM replacement)

  • 28 PSI & 36 PSI (for high-performance applications)

  • Available in Raw Aluminum or Anodized Black

• Proudly Made in the USA

Additional Notes:

• Light surface scratches or small imperfections may be present due to the manufacturing process.

• In Stock and Ready to Ship!