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COBB Coolant Overflow Tank 2015-2021 WRX / 2015-2021 STI

SKU 800660
Save $27.56 Save $27.56
Original price $265.00
Original price $265.00 - Original price $265.00
Original price $265.00
Current price $237.44
$237.44 - $237.44
Current price $237.44
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The OEM Coolant Overflow Tank for the 2015+ WRX/STI does its job well enough but the cheap plastic material is ugly and will potentially crack over time, especially when driving hard and going through extreme heat cycles. Its shape is also clumsy and obtrusive when adding an aftermarket FMIC.

The upgraded COBB Subaru Coolant Overflow Tank solves these problems without any sacrifices. Constructed of welded aluminum with the same 1L capacity of the OEM tank along with internal and external anodizing. The COBB tank looks much better under the hood while providing a very simple relocated mounting solution that works perfectly fine on a stock car. Its shape is also more conducive to fitting piping from an aftermarket Front Mount Intercooler.

A custom COBB Delrin cap is included which is highly heat resistant and adds to the overall clean look. Plus, the kit comes with a silicone adapter hose and injection molded cap for the washer fluid reservoir, giving a uniform look.


  • Maintains OEM 1L Capacity
  • TIG Welded Aluminum Tank
  • External and Internal Anodizing
  • Custom Delrin Heat Resistant Cap
  • Single Fastener Removal/Re-Install for Easy Service

Customer Reviews

Based on 5 reviews
Alonzo Barrera

This little product is amazingly made. From the welding to the little details it's an amazing product. I would recommend to anyone that is not getting a Front mount intercooler. The only FMIC that fits is Cobbs, any other brand will not fit and need to be back on OEM or relocated again.

This is my issue it's going to be happening soon. I wish I would have known that I had to get cobb and not Grimmspeed, I would have bought cobb, but I was trying to save a quick buck but I also wanted red piping.

Just make sure if you buy this that you keep the oem coolant reservoir or buy another one if you don't go with Cobb FMIC


Thank you for your 5-Star Review and added pic of the COBB Coolant Overflow Tank. It's great to hear that you found the product to be well-made and of high quality. It's also helpful for potential buyers to know that this product is compatible with COBB's front mount intercooler, but not necessarily with other brands. Thank you for sharing your experience and recommendation.


Steven finn

Beautiful piece very well made. Easy install and cleans up the engine bay.


The COBB Coolant Overflow Tank is a fantastic replacement for the ugly, prone to cracking OEM tank! This TIG welded aluminum looks fantastic under the hood and the simple relocation provides a better fit for aftermarket FMIC piping! We appreciate your 5 Star Review!


moses dasilva
nice product

nice product helped a friend install his took like 20 m. Cleans up the engine real well.


Thank you for the 5 Stars! The COBB Coolant Overflow Tank is a huge upgrade from the brittle factory plastic tank! As you said installs in about 20m and really does clean up the engine bay! It will last the life of your vehicle!


Craig Hullen
Great Looking Product!!

The fitment and finish on this piece is awesome. It took me more time take out the old system then put the new system in. Love how simple it is and designed to be out of the way in case I add a FMIC in the future


The COBB V2 Coolant Overflow is really a sweet piece! It looks phenomenal and is a very simple design! You don't have to worry about cracking like the OE plastic with the aluminum tank! Thank you for the 5 Stars!


Martin Burnell
Cleans up the Engine

Removes some of that wonderful white and yellow plastic that we all love to see in the engine bay. Also that sweet black aluminum housing eliminates any possibility of cracking and failing held by the OEM part.


Thank you for the 5 Star Review! Yet another great piece to add that personal touch! The stock white yellow plastic just doesn't cut it when you have such a great ride, and as you say its functional too!!


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