My ahem "nature" would not allow my R12R pipes to discolor and have to be repeatedly cleaned. So I had mine ceramic coated by a company now owned by JetHot Coatings
Much more pleasing to my eye, and it saves a bunch of time recleaning the things. Cost was sub $300.00 including round trip shipping. I have since found a coater in Indianapolis that does it so when I do the new Buell this winter I'll just drop them off.