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Night said:getting back to wraping your extractors in thermal wrap, I've been told that they cause your extractors to overheat cause they don't allow the heat to escape thus shortening the life of your extractors. As we know steel tends to deform when over heated. Race cars normally use it but they change their manifolds every race. Wouldn't it be better to fit some sort bonnet scoop to get the hot air out (plus some of them look pretty tough)