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Originally Posted by AcesHigh
That is a myth. Allowing heat to escape from an exhaust manifold is a very nasty thing, not only filling your engine bay with hot air but also doing harm to your electronics, such as the alternator. It is why factory Preludes come with heat shields. You want your hot air (and subsequently, heat) to come out of the muffler, not in the engine bay.
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i'm not trying to start something here, but i've seen it used to heavily, where it cracked the header. but i would have to admit it was a ceremic header, which may of had somethig to do with it. it's a lot harder to crack a steel one, unless it's a pacesetter
