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Old 11-12-2011, 09:19 AM   #237 (permalink)
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4.0L Jeep engines run hot, blocking the grill may not be the best thing to do unless all you do is highway driving and even then it might not be too good an idea. A more permanent but probably more effective way to reduce pressure build up under the hood would be to add air extractors to the hood itself. The added bonus of is that you also reduce front end lift at high speeds keeping the vehicle more stable.
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