Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021
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Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021

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Mishimoto Aluminum Coolant Expansion Tank - Subaru WRX 2002-2007 / STi 2004-2021

Add some additional reliability and engine bay styling with the Mishimoto Subaru WRX 2002–2007 / STI 2004–2014 Aluminum Coolant Expansion Tank. Stock coolant expansion tanks are prone to failure after years of constant temperature variations. The Mishimoto tank is constructed from durable, TIG-welded aluminum with barbed fittings for optimal durability and longevity. This expansion tank provides a 50% increase in capacity compared to the stock unit. It features a polished silver or anodized black finish that will look great in your engine bay, and it matches the Mishimoto Subaru WRX/STI Performance Aluminum Radiator!

The Mishimoto Coolant Expansion Tank is engineered for perfect fitment in the 2002–2007 WRX and the 2004–2014 STI! As with all our products, this expansion tank includes the Mishimoto Lifetime Warranty.

Specifications: 

  • OVERALL HEIGHT 98mm (3.85")
  • OVERALL WIDTH 159mm (6.25")
  • FLUID CAPACITY 776 cc


Kit Includes: 
Aluminum Expansion Tank
Mishimoto Radiator Cap
Lifetime Warranty

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Returns Policy

Returns may be accepted within 14 days of purchase pending Return Merchandise Authorization (RMA). No returns or cancellations on special order items. All returns will be charged a 20% restocking fee, no exceptions.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Item must be able to be resold as new. Several types of goods are exempt from being returned. Hazardous materials, fluids, greases, chemicals, and clothing are not able to return.

Free shipping is available within the lower 48 states for most orders totaling $199 or more. A free shipping option will be available during checkout. This offer is for delivery address in the continental United States and excludes shipments going to Alaska, Hawaii, Military Boxes, and items that require freight shipping.

Processing Time
Patterson Performance stocks a large quantity of items at any given time. Some items may require drop shipping from one of our various distributors. In stock items will ship within 1-2 business days. If you're needing your product quickly, please contact us to verify product availability before placing your order. Orders requiring additional verification (security concerns, incorrect information, etc.) may need additional processing time. Estimated shipping dates are not guaranteed and are subject to change based on inventory levels and manufacturer lead times. Backordered items are shipped immediately once available.

Items ship daily, If the item you ordered is not in stock, a member of our team will contact you via email / phone.

Patterson Performance will only ship to an address that varies from your billing address if payment is made via Paypal or a financing partner.

Patterson Performance ships from multiple warehouses throughout the United States, and sometimes from manufacturers overseas.

You can simply contact us via email / telephone for a live inventory check

P65 WARNING: Cancer and Reproductive Harm

Find more information at www.P65Warnings.ca.gov.

Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

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