Bill:
The company that started it all is HPC Coatings. Had a set of coated pipes on my car for 9 years. Took the motor out last year and as Murphy would have it, I bent one of the short tubes that go from the head to the collector. I was able to get a replacement pipe for only $35.00, but it wasn't coated. I called HPC to see if the new pipe would match the old. They told me if I had the original reciept, they would re-coat the entire system side pipes and all for nothing (normally $450.00). They even went one step further and straightened out the tip of one of my side pipes that got damaged in shipment for no charge.
The coating buffs very easily by hand with a special polish that they send with your order. They look just like chrome. Can't say enough about the company!
HPC
Jeff