Seller notes

This is the Genuine, Dual Viton O-ring, MMR Head Cooling Mod - not the fake UPR Copycat. If it doesnt say MMR it is a poor quality copy or a single O-ring Leaking fake from China!! Get the Genuine MMR product backed up by 100% Positive Feedback since 2004 and the Ford Coyote Engine World Record to top it off!! MMR's cooling head mod ( HCM ) for the 2011-2017 5.0 (please see the MMR website for the 2018+ version) Coyote is designed to help eliminate hotspots in the #8 cylinder by promoting coolan...

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