will the header wrap for wrapping ur headers really make u gain more hp and decrease heat or is it just for look retro style

 

It will keep heat out of the engine compartment, and you will gain a little HP.

 

I'd go with Jet-Hot coatings if I could. Kinda expensive. Wraps can trap moisture between the layers (rainy days, cold mornigns) and cause steam (which may or may not be visible) or even worse premature degradation.

 

Only if they are not put on right, if you wrap it tight and it seals good its not a problem. Another and better looking way of doing it, is to have them powder or ceramic coated. That will also give you the heat disapation properties you want.