• 15+ Years of Performance Parts, Tuning & Installation

STM Evo 4/5/6 Coolant Overflow Reservoir *Limited Quantity*

  • Backed by real installs and tuning experience at FAST of West Chester
Out of stock
Select Finish

Everyday Low Price:

$209.00
$209.00
Shipping calculated at checkout.

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Sorry, it's out of stock.

But we can let you know when it's back in.

Sold out

Limited quantity of select finishes.

Currently Unavailable if select finishes are out of stock(unable to ADD TO CART). We have plans to redesign this part, but no timeline on when that will happen. 

The STM Evo 4/5/6 Coolant Overflow Reservoir is a direct replacement for the stock, plastic tank. Features a lightweight, aluminum construction, handmade in-house at STM with your choice of finish option. Includes a black anodized cap, stainless allen bolts and washers, brass drain fitting and high-quality silicone hose for a clean and simple install.

Vehicle Fitment:
1996-2000 JDM Evolution IV V VI

Features:
• Hand Crafted
• Lightweight Aluminum Body
• Tig Welded
• Back Purged
• Stainless Hardware
• Brass Drain Fitting
• High-Quality Silicone Hose
• Bolts to Factory Location
• Replaces OEM part number MR355199

STM Products are made in the USA!
Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.

Options:
• Brushed Aluminum
• Polished Aluminum (+$30)
• Gloss Black Powdercoat (+$30)
• Wrinkle Black Powdercoat (+$30)

Includes:
(1) STM Reservoir with Matte Black STM Cap
(1) 4 Foot Length 6mm Silicone Hose
(1) 90° 1/4" NPT to 3/8" Brass Barb Fitting (69945)
(2) M8x20 Stainless Allen Cap Bolts
(2) M8 Stainless Flat Washers
(1) M6x16 Stainless Allen Cap Bolts
(1) M6 Stainless Flat Washers

Shipping Times: 1-14 Days
Hand crafted and welded in New York, please give our fabricators time to assemble your parts!

See more STM Parts
See more STM Products
  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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