Thank you! By all means, ceramic coat away! For maximum benefits you would want to coat inside and out for corrosion resistance and heat retention, the two main benefits of ceramic coating. The end result should be headers that look great for a long period of time, reduced temperatures to surrounding components, and higher / faster exhaust flow as you are keeping the heat inside the exhaust and efficiency up. Just be mindful of the maximum temperature limits of the coating you use. We recommend considering Jet-Hot coating - we use them for our needs including our McLaren exhaust components. Jet-Hot also has a lifetime warranty on the coating. We've experimented with several companies and so far have had the best results with JH, some other companies have flaked off even with a proper prep job.I just bought your competition headers. They just arrived and are beautiful and well made. Do you have any recommendation on whether or not to ceramic coat? And if so, inside, outside or both?