COBB Coolant Overflow Tank Subaru WRX / WRX STI (04-07) with Washer Fluid Relocation Kit - 800630

Fitment Information

• Subaru WRX Sedan / Wagon (2004, 2005, 2006, 2007) 
  • Fits Manual and Automatic Transmission
• Subaru WRX STI (2004, 2005, 2006, 2007)
  • Fits Manual Transmission

Specs & Features

• Space Saver: Relocates and tucks the coolant reservoir lower in the engine bay, creating essential clearance for Front Mount Intercooler (FMIC) piping.
• Stealth Finish: Constructed from durable aluminum and coated in a Wrinkle Black Powder Coat to hide grime and blend perfectly with other high-end engine bay components.
• Washer Integration: Includes a specific Washer Reservoir Filler extension (Tubing, Delrin Base, & Cap) for 2006-2007 models where the tank is hidden behind the bumper.
• Factory Fit: Cleverly designed to utilize your Factory Overflow Cap, ensuring a perfect seal and one less part to worry about replacing.
• Signature Style: Finished with a sharp Laser-Etched COBB Logo for that premium touch.
• Compact Capacity: Features a .5L volume, perfectly sized to handle overflow without taking up unnecessary real estate.

Product Description

If you own a 2004-2007 WRX or STI, you know the struggle: the engine bay is cramped. The moment you decide to upgrade to a Front Mount Intercooler, the factory coolant overflow tank becomes a massive roadblock. It sits right where your charge pipes need to go. The COBB Tuning Coolant Overflow Tank is the fix. Originally designed as a critical component of our FMIC kits, we released it as a standalone part because it’s just that good at cleaning up the bay.

This isn't just a shiny box; it's a relocation kit. By moving the coolant overflow lower and out of sight, we open up a massive channel for your intercooler piping to run smoothly. The tank is built from aluminum and finished in Wrinkle Black, so it disappears visually into the engine bay—no more ugly white plastic jug staring you in the face.

For the 2006-2007 "Hawkeye" owners, we solved another headache: the windshield washer fluid. Since your reservoir is buried behind the bumper, accessing it can be a pain once you start modifying. This kit includes a custom Washer Reservoir Filler with a Delrin cap and extension tube, bringing the fill point up to an accessible spot while keeping it looking factory-clean.

COBB Tuning knows the GD chassis inside and out. We built this part because we needed it for our own race cars, and now you can have it too. Whether you are installing a massive front mount or just want to "shave" your engine bay for a cleaner look, this tank combo is the answer. Get rid of the clutter and get your build sorted.