Heating and Cooling› Overflow Tanks and Catch Cans

STM

Aluminum Coolant Overflow Reservoir

$199.00

SKU: STM-CT9-CR

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The STM coolant overflow reservoir is a direct replacement for your stock, plastic tank on the Evo 7/8/9. It features a lightweight aluminum construction, handmade in-house at STM. This reservoir bolts to the factory location and replaces OEM part number MR464624.
Show original supplier description
The STM Evo 7/8/9 coolant overflow reservoir offers a direct replacement for the factory plastic tank, featuring a robust, lightweight aluminum construction that is tig-welded and handmade in-house at STM. This upgrade ensures durability and a clean aesthetic for your engine bay. The reservoir is designed to bolt directly to the factory location, serving as a direct replacement for OEM part number MR464624. Constructed from 6061 aluminum with stainless hardware and a brass fitting, this reservoir is built to last. It weighs approximately 1.48 pounds and is proudly made in the USA. STM offers a lifetime warranty on their parts against manufacturing defects to the original purchaser. Available finishes include Brushed Aluminum, Gloss Black Powdercoat, and Wrinkle Black Powdercoat, allowing you to match your desired engine bay look. The kit includes the STM reservoir with cap, a 4-foot length of 6mm silicone hose, a 90° 1/4" NPT to 3/8" brass barb fitting, and M6 stainless allen cap bolts and flat washers.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSTM
Part NumberSTM-CT9-CR
CategoryHeating and Cooling
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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