That is what I was thinking, maybe too much cool air in the winter. Thankfully I am in Florida and will take them off and allow all the cooling possible to reach the radiator. If you watched GT academy, Nissan actually added large round air inlets above the bumper to get a huge amount of air in there.
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2014 370Z 6MT Sport Midnight Blue
2013 GT-R Aurora Flare Blue Pearl
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