Product Description:
Upgrade your cooling system with a Straightboost® Custom Aluminum Coolant Expansion Tank, designed specifically for the 1999–2007 Chevrolet Silverado. Whether you’re replacing a brittle OEM plastic tank or creating clearance for a turbo setup, this tank delivers superior durability, performance, and a clean custom look.

Built from high-quality aluminum, this tank is fully TIG welded for strength and longevity—eliminating the common cracking and aging issues found in factory plastic units. The design ensures proper fitment while improving reliability under high-heat, high-boost conditions.

Fitment:

• Direct fit for 1999–2007 Chevrolet Silverado

• May fit other GM vehicles equipped with the same style plastic expansion tank (contact us to confirm compatibility)

• Designed to clear turbo setups and prevent overheating issues

• Note: Will not work with factory filter or airbox. Does not include coolant level sensor port.

Custom Options Available:
We can build tanks with alternative fittings or relocated ports. Contact us to discuss your specific needs.

Specifications:

• Brand: Straightboost®

• Material: Aluminum (Natural Finish)

• Construction: Fully TIG Welded

• Radiator Cap: 16 PSI (28 PSI & 36 PSI options available)

• Dimensions: (See photo for reference)

  • 10" (254 mm) Length

  • 4.5" (115 mm) Width

  • 8" (203 mm) Height – Larger side

  • 5" (127 mm) Height – Lower side

Additional Details:

• Proudly Made in the USA

• Light surface scratches may be visible due to the manufacturing process

• Authentic Straightboost® product — beware of imitations!