There's no reason to pay anyone to ceramic coat anything anymore. The new breed of air-cured ceramic coatings perform just as well and you can easily strip/reapply them if necessary. I've had black air-cured coating on my roadster's exhaust for six years now and it's holding up better than the oven-cured silver on my Thing's header.
www.cerakotehightemp.com/finishes/And now that the hype and glory of ceramic is over do as Don recommended and go black. It makes a car look more grown up. I always thought the silver looks cheap like spray chrome.
You'll have to have the existing coating sandblasted off before applying a new finish. It's not exactly cheap but it's far less expensive than baked-finish coatings.