I went to Fireball Performance Coatings
. I was referred by a friend and they had some good reviews online. I had my exhaust tips powdercoated black and also the inner barrel ceramic coated. The ceramic coating was to withstand the heat but after driving a bit, I've already burnt off all the coatings in the inner barrel
They are a bit far, but they have a drop off location somewhere in the GTA. Prices are decent, people are very nice and friendly to work with. Hope this helps.