Try Jet Hot, here in town (Tempe, I beleive).
As far as wet or not? Depends on what you can get away with where you run. Decibel regulations pretty much kill dry headers without 4 foot mufflers hanging off them. Should be a fine finish, but will lose some shine dry, I should think.
The original Chrome should be fine, and stay chrome and shiney from the water injection ports on if everything is working properly. (gonna blue at the heads, 'tis the way it is)
Look at mine, 1 loose hose clamp and I blued the hell outta them! Kinda matches the engine now, "Blue Away" is working, need to spend som more time buffing with it to see if it'll fix that or not. Kinda like them the way they are, tho, actually. Gives the look of Horsepower!
Just my .02
Ray