I honestly don't agree with Cobb's assement here. I think that it will give some benefits. We've seen Nick's car with these exact headers on it, and it puts out better numbers then without.
If you are worried about heat loss, you could always try wrapping them, but I don't think that is necessary.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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