UPDATE 12-7-2017 ----------------No, it still exists the same problem . Luckily I kept my Nismo hat. It works fine. How hard can it be, right? Well I guess they got too carried away with their cap design. Take it easy, fool. UPDATE 11-6-2014 ---------------- Contacted Mishimoto customer service and they sent me a new "recycled" cap. This works and allows coolant to flow back and forth between the radiator and expansion tank. One small issue: the radiator neck is slightly higher than stock and the Mishimoto caps are larger and not as low as the OEM radiator caps so they make contact with the inside of the hood when closed. BUT the coolant flow problem seems to be solved with a new cap. UPDATE 3-11-2014 ---------------- I noticed that as the engine cooled down, the radiator hoses collapsed. and fluid does not flow from the radiator to the expansion tank. It seems that the hole on the radiator neck is too high and the cap prevents liquid leakage and backflow. This is a known issue with Mishimoto heatsinks for this application. Too bad I didn't see all the complaints sooner. Seems like Mishimoto should know about this issue too. I ended up having a different radiator cap which allowed the coolant to exit the radiator but the hoses still narrowed as the engine cooled indicating no fluid was returning. I had to modify the cap a bit and now it works as it should. I still like the look and it works well in terms of cooling. However, Mishimoto needs to think a little more about the neck design. Please fix this little problem Mishimoto and you will have a very good product. The price of this radiator was reasonable and required no labor as I installed it myself so I ended up saving money going to the store or dealer. You can already see from the packaging that they are proud of their product. Nice box, well wrapped in foam and sealed in a thick plastic bag. The fit was exact. I reused the factory fan and fairing. You will need new bolts to attach the stock fan cover to the radiator as the stock bolts thread into the plastic of the OEM top tank. The size required is the same as the screws that hold the top brackets in place. Unfortunately, I don't know the size by heart, I also bought new rubber bushings from the dealer. They cost less than $2 each. Overall I am very pleased with the look, installation and performance of this radiator.
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