I wonder how the moisture myth began. Do headers get wet just sitting there with a hood? Or does driving in water somehow magically cool off the headers so much that splashed water can not boil/evaporate off? Wrapped headers "rot" because of extreme heat cycles causing metal fatique, and the accelerated oxidation caused simply by being exposed to O2 in the air at very high temps, think welding steel without a shielding gas, the end result looks like rust, and it actually is, but trapped water plays little role.

OP, consider the headers junk or soon to be if driven beyond a 1/4 mile.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.