Name: EVO-X 4B11 Coolant Expansion Header Tank
SKU: 4B11-EXTANK
Availability: InStock

EVO-X 4B11 Coolant Expansion Header Tank

Features
- CNC laser-cut flanges
- Precision TIG-welded in-house
- Direct bolt-in replacement
- Billet high-pressure radiator cap
- Optional AN-fitted block-off plate for electric water pump conversion
- Heat-optimized routing when using an electric water pump

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SKU: 4B11-EXTANK Category: Cooling Tag: Made to Order

4B11 EVO-X Coolant Expansion Tank

Our 4B11 EVO-X Coolant Expansion Tank is a direct bolt-in replacement for the OEM thermostat housing, engineered for performance, reliability, and clean engine-bay aesthetics.

This tank includes an additional bleed point and a billet 3-port NPT plate, simplifying plumbing and sensor integration when upgrading to an aftermarket ECU setup. It also accommodates OEM sensors for those retaining factory electronics.

For builds running an aftermarket electric water pump, the tank can be customized with AN-fitting welds for seamless integration. We also offer a CNC laser-cut block-off plate with a welded AN fitting that bolts directly to the water-pump housing — available as an option.
When running an electric water pump, this setup eliminates the OEM hard line that runs beneath the hot turbo manifold, allowing you to route lines directly from the water pump housing in the opposite direction — away from excessive heat exposure for improved reliability and efficiency.

If you’re retaining the OEM mechanical water pump, the system can be configured with an inline thermostat housing back to the radiator to maintain optimal cold-start engine temperatures.

Features

CNC laser-cut flanges
Precision TIG-welded in-house
Direct bolt-in replacement
Billet high-pressure radiator cap
Optional AN-fitted block-off plate for electric water pump conversion
Heat-optimized routing when using an electric water pump

BLACK POWDERCOAT	YES, NO

Order Processing Times

All orders require 1–3 business days for processing before shipment.
Processing time depends on order volume, workshop workload, and the type of product ordered.We do not process or ship orders on weekends or public holidays.If there are any unexpected delays, we will contact you directly

Shipping Times & Delivery

Shipping time refers to the time it takes for your order to arrive once it has been dispatched. Estimated delivery times within Australia (depending on your location) -

Standard Shipping: 2–8 business days
Express Shipping: 1–4 business days

Delivery times are controlled by the courier and may vary due to location, public holidays, weather conditions, and other factors outside of our control.