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I think if you have any exhaust leaks they'll find their way through the firewall somehow, mine do !! LOL My 66 Mustang was notorius for high lift at the hood surface, i installed a pretty radical front spoiler and killed the lift and also made the engine run much cooler in the summer, I ran a pinned on hinge less glass hood, and with the spoiler off and the rear pins removed the back edge of the hood would lift off the supports at around 40 mph , with the spoiler on ,the hood would stay flush with the fenders all the time , thus indicating no buildup of air under it. pretty well unused Mustang mod.
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