header wrap

can anyone tell me what it does, what its supposed to do, and why i cant get a straight answer as to whether or not its a good thing?

Header wrap is a good thing. The idea behind header wrap is to keep under hood temperature down and keep the exhaust temperatures high which help exhaust velocity and performance overall.

yea its good. it keeps the engine temp down b/c the exhaust heat doesnt spread into the engine and the cooler air from the engine doesnt go into the exhaust so it works for both of them. gives u better air flow.

Header wrap is a good thing. The idea behind header wrap is to keep under hood temperature down and keep the exhaust temperatures high which help exhaust velocity and performance overall.
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The benefits are even greater on a turbocharged vehicle as it helps maintain maximum exhaust energy to the turbine.