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Hey Hoff,
Remember the 908 we saw at Porsche fest? The headers were wrapped on it, and the Corvette that was there. Since both of these cars were full blown race cars used for endurance racing ( '73 LeMans ), I would say it had some advantage. Since weight is everything in racing, it wouldn't be there if it wasn't needed. But what was said was right, if you insulate at one point, the heat will migrate to some other point. Flowmaster said that their muffler would lower underhood temps, and they were right, the muffler gets much hotter than the stock unit! It has even turned the chrome on my tip blue. I thought about wrapping the exhaust from the header all the way back, including the muffler. But with my luck, my exhaust tip would glow red!
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