Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Mishimoto Rockstar Performance Aluminum Coolant Expansion Tank

Mishimoto RTWRX01ERKST


jegs shipping
FREE Shipping
Estimated to ship directly from the manufacturer on 07/31/18
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Mishimoto Rockstar Performance Aluminum Coolant Expansion Tank $161.25
Rockstar Performance Aluminum Coolant Expansion Tank
  • 2002-2007 Subaru WRX
  • 2004-2016 Subaru WRX STI
  • Black Anodized Finish w/ Rockstar Logo Radiator Cap

  • Mishimoto RTWRX01ERKST Details


  • Direct fit for the 2002-2007 Subaru WRX and 2004-2016 Subaru WRX STI
  • 50% greater capacity than stock plastic expansion tank
  • 100% aluminum, fully-welded construction for maximum durability during repeated cold and hot transitions
  • Leak-free welded barb fittings
  • Rockstar® branded radiator cap
  • Durable anodized black finish
  • Mishimoto Lifetime Warranty

  • Add some reliability and engine bay styling to your vehicle with an aluminum expansion tank from Mishimoto. All Mishimoto Expansion Tanks tank features internal baffles to prevent coolant starvation from overflow ports on the engine. Also, during high-speed cornering, braking, and acceleration, the internal baffles reduce coolant sloshing. The engineers at Mishimoto have included a sight tube to allow for proper observation of hot and cold coolant levels, making engine maintenance much easier.

    Eventually, you’ll have to consider the health of your plastic expansion tank. Plastic is prone to failure after years of constant temperature exchange cycles. Each Mishimoto tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. All Mishimoto tanks reuse the stock expansion tank cap.

    It’s worth noting the most stock expansion tanks are an engine bay eyesore, whereas the Mishimoto tanks come in different colors and finish variants to help with aesthetic customization. For convenience, you can install your new coolant tank upgrade in under one hour as it was engineered with perfect fitment in mind. Each expansion tank also includes the Mishimoto Lifetime Warranty.


    • 100% aluminum, fully-welded construction for maximum durability during repeated temperature transitions
    • Sight tube allows for proper hot and cold coolant levels
    • Internal baffle keeps coolant near overflow port during aggressive driving, preventing air entry into the coolant system
    • Fits with stock overflow tank cap
    • Mishimoto Lifetime Warranty

    Some parts are not legal for use in California or other states with similar laws / regulations