The COBB 04-07 Subaru WRX / STI Coolant Overflow Tank w/ Washer Fluid Relocation Kit does not have enough exact application evidence to assign safe vehicle YMM. Match manufacturer part number 800630, complete vehicle, engine and transmission configuration, factory equipment, required calibration, emissions eligibility, interfaces, and every product note before ordering.

Key Features

• Increased Coolant Capacity: Larger high-temperature nylon reservoir holds more fluid than stock for reliable cooling under load.
• Billet Aluminum Cap: Anodized cap with -10AN fitting enables quick filling, venting, and pressure management.
• Washer Reservoir Relocation: Moves OEM washer tank behind battery tray with included brackets for a streamlined engine bay layout.
• Made in USA: Precision-crafted for durability and exact fit on GD-chassis Subarus.
• Bolt-on design uses basic hand tools 1-2 hours typical labor.
• High-temperature nylon tank for heat resistance, paired with anodized billet aluminum cap and stainless fittings.

Fitment

Specifications

What’s Included

One new COBB product in the exact configuration and quantity identified by manufacturer part number 800630. Calibrations, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, tools, and companion components are included only when expressly stated for this exact part number.

About COBB

COBB develops engine-management, intake, cooling, exhaust, drivetrain, suspension, and vehicle-accessory products for supported performance platforms. Correct selection remains exact-vehicle, exact-configuration, exact-interface, and exact-part-number specific.

Related COBB Products

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• Cobb 22-23 Subaru WRX Coolant Overflow Tank

Browse the COBB collection for related tuning, intake, cooling, exhaust, drivetrain, and chassis products.

Frequently Asked Questions

Why is fitment verification required for this COBB product?
Exact vehicle application evidence is not complete enough for safe YMM. Confirm the vehicle, drivetrain, factory equipment, calibration, emissions eligibility, interfaces, and exact part number before ordering.

Are all supporting parts included?
Only components expressly listed for the exact manufacturer part number are included. Tuning, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, and companion components may be separate.

Is tuning or calibration required after installation?
Requirements depend on the exact product and vehicle. Intake, fuel, boost, turbo, and engine-management changes may require a compatible calibration before operation.

Installation Instructions

Follow the current COBB and factory service instructions for this exact part number. Verify fitment, factory equipment, emissions eligibility, required calibration, software and firmware, interfaces, hardware, fluid or electrical connections, and clearances before installation. Inspect the completed work and confirm safe operation before full-load use.