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Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir (Part Number: )
Killer B Motorsport Upper Turbo Coolant Reservoir
Subaru WRX 2002-2007 / STI 2004-2014
Read 5 Reviews | 4 Q&As
Part # UTCR

Ships within 28 days

Features & Product Details

RallySport Direct proudly carries a great selection of quality performance upgrades and accessories brought to you by the metal masters at Killer B Motorsport. 

Here, you are looking at the Killer B Motorsport Upper Turbo Coolant Reservoir. Killer B Motorsport designed this particular coolant reservoir to sit higher than the radiator filler neck to allow you to fill your cooling system while allowing air to escape traditionally. Although it utilizes OEM high-point mounting points, you can mount this reservoir elsewhere for those running a rotated setup.



  • Fits all metal WRX and STI turbo intake manifolds
  • Full 3D CNC machined neck and body
  • Hand TIG welded barb connections and bracket
  • 1/4" thick CNC laser cut bracket
  • Powder-coated black
  • NOTE: Recommended to use the OEM radiator cap
  • Specifications

    Brand: Killer B Motorsport
    Color: Black
    Installation Hardware Included: No, reuses OEM
    Material: Aluminum
    Cap Included: No, must use OEM Subaru
    Mfgr. Warranty: Limited Lifetime Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



    5 Reviews
    4.2 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    No user media. You can upload a photo or video of your install by posting a review.
    Killer B reservoir  1 year ago
    3out of 5stars

    I want to preface this by saying I love Killer B products. I have their oil pan kit and their headers. But I’m not so sure they hit the mark on the reservoir. With other products, you can be sure that the fit and finish is 100% no additional modification. In the reservoirs case it doesn’t exactly go together. I am speaking of the barbed NPT fitting. The product says it should only be used with an OEM cap, which I have. But when you tighten the barbed fitting into the reservoir, the threads go so deep that you can’t insert the cap. I was taken back by this because I never had a problem with Killer B so I had to make sure I had the OEM cap, thinking that I was the wrong one here. Sadly, no. The barbed fitting when tightened all the way won’t let the cap inside the reservoir. So I thought, no big deal I’ll trim the fitting. Trimmed it so the cap can insert, which it does but when you seat the fitting against the boss, the cap isn’t able to turn because the hex portion of the fitting is now in the way of the caps flanges. I began to wonder if I had something wrong again and realized that if the fitting was 1/4” unscrewed the cap would clear entirely. But alas, even with ARP thread paste, the fitting would leak. So after some more modifying of the fitting I got it to seat, leak free and the cap to install. Also I should mention that the reservoir makes the cap twist on in a counter clockwise direction, different than OEM. Otherwise the product looks great and fits well everywhere else. I’m not sure why they did not weld on a barbed fitting like the rest of the fittings on the piece? My only guess is to accommodate different setups and if this is the case they really only need to extend the neck an inch to be able to make it all clear so it really is a “bolt on” affair. Performance :5 ; Ease of install:2 ; Value:4 ; Quality:3
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    Rotated 2 years ago
    5out of 5stars

    A well made piece that makes rotated layout cleaner and easier. Like others have mentioned, the only annoying thing is the tight clearance / potential interference between the brass nipple and cap. Everything else about it (except possibly the price) is perfection.
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    2004 wrx 4 years ago
    5out of 5stars

    I bought this because I needed a lower profile tank due to the rotated setup and intercooler piping. All in all it is a good product... Gave me plenty of room for what I have. As a few others stated... The screw in nipple is a little higher than it should be but the reasoning is... that is the thickest part of the body and will be able to give enough support for the threads. Aside from that I am very pleased and thrilled someone came up with that exact design! Did I hate spending that much on something that small... Sure but you get what you pay for 99.9% of the time. I say if you are looking for a replacement or have plans for upgrades this is well worth it...
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    Small and a bit frustrating (updated) 5 years ago
    4out of 5stars

    PAY ATTENTION WHEN INSTALLING THE TOP BRASS NIPPLE! If you do not have the cap in place or take note of how far you are threading the nipple in you will not be able to put your stock cap on or you can over-tighten it and make the function of the cap obsolete. Currently I am experiencing loss of coolant and/or lack of antifreeze in my reservoir. This may be due to this unit but I will post an update as soon as I know. After further review I noticed that I had pinched the lower discharge hose. Please note when installing that you may need to trim the lower discharge hose up to an inch to allow proper fitment. After making this adjustment the unit is working. Temperatures obtained from my AccessPort V3 show normal operating temperatures at highway speeds around 190 degrees. I hope this helps!
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    Great coolant reservoir 5 years ago
    4out of 5stars

    This coolant reservoir works on STi's with stock location turbos and Is made completely out of aluminum and comes with very tight threat copper or brass screw in nipple and you should not have nipples break off like they do on the oem part. PROBLEM 1 screw in nipple gets in the way of the cap and you have to put cap on then screw in the nipple after and be carefull not to screw the nipple so far in the the caps seal that you let pressure out or maybe even do damage to the cap. PROBLEM 2 is the price it just seem a bit to expensive for what what it is and the size but maybe I don't now what I'm talkin about lol.
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    • Q: 2011 sti  Manuel2011STI4 years ago

      since im running a rotated turbo set up that the turbo is only oil cooled, how can i go by removing the oem one and how do i reconnect the lines?? or will this one work as a replacement of the oem one even though the line will run straight to the return
    • Q: 2008 WRX with an N/A intake manifold and Dom 2.5xtr  Stephenbeaumier063795 years ago

      ^^^ So this cannot be used as an OEM replacement? I need to relocate when I swap out to an N/A manifold and Dom 2.5xtr. I am looking for a SMALL low profile upper coolant res and thought this might work.
      • 0 of 0 people found the following answer helpful

        A:  This will work just fine for your application.

        guest56ad69792a8d256e198b66b5 @
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    • Q: placement for oem replacement  gsmith3045 years ago

      would this go in the same spot as the oem one (non rotated setup) so i could add this for some underhood flair as well as cooling purposes?
      • 0 of 0 people found the following answer helpful

        A:  This would not work with a non rotated set up.

        guest57853c642a8d25b5018c44a7 @
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      • 0 of 0 people found the following answer helpful

        A:  Yes, this will work the same with the rotated or non-rotated set up.

        guest57853c642a8d25b5018c44a7 @
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    • Q: 2006 WRX  Slap Dash5 years ago

      My Current OEM Turbo Coolant reservoir broke at one of the nipples. I plan on upgrading my Turbo in the future.. Would this work fine for direct replacement of said reservoir? Thanks,
      • 1 of 1 people found the following answer helpful

        A:  This will be a great OEM replacement! With a rotated turbo set up, this coolant tank will need to be relocated or removed. Thank you.

        Sterling W. @ RallySport Direct 5 years ago  
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