Header wrap on crossover?

[Dallasneon]

I don't think anyone thinks you would increase power by wrapping headers. About the only thing I know its good for is retaining the heat within the exhaust pipe. Which may help with underhood temps.

Its not gonna help the TB with incoming air due to the residence time of the air passing thru the TB. Like Bio said, its not there long enough to increase by any significant amount.

[Silver GTP]

Wrapping also keeps heat in the metal that your pipe is made of causing it to degrade faster. I did a lot of reading on this issue before I put my headers in and decided against any wrap.

[SlowNA06]

Which may help with underhood temps.

Lower temps would allow increased timing to create more ponies. But you wouldn't see lower under-hood temps. At all. So no ponies.

[Vegas~Blown]

I wrapped my crossover because I had the stuff on-hand to do it --- it dropped the tb temp by about 20 degrees, not that it makes any difference mind you.