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If you are going to block off that much frontal and lower air flow, you may look into something that will allow some flow out of the back of the hood. cheap racer trick is to add a couple of washers to the mounting brackets(between the hood and the pivots) so that the hot air gets pulled out of the back of the hood. There may be no need on the little 1.0L cars, but I would bet that things are really getting taxed on the larger vehicles. at the very least the under hood temps are getting so high that its going to cause the intake air temp to climb rather high, which will really be a negative hit on efficiency. Even with a fresh air intake added, the heat soak in the intake manifold will be taxing.
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