Yoshimura ceramic coating longevity

[emptysea]

OK... I have never paid much attention to what the coating is on my Yoshimura exhaust. It's black and the website from where I purchased describes it a "heat resistant". I don't know if that's ceramic or not, but I don't see a ceramic coated option on that site. So, if it's helpful, I've had this exhaust since 2014 and have ridden roughly 50,000 miles with this exhaust in place. Here's what it looks like right now.

[url=https://imgur.com/ia9Cvzx]

As you can see the lower portion is starting to discolor. I think that if I took more than an S100 minute to clean them, they'd look a lot closer to original, but the pipes and all the connections are still solid so I'm ok with the pipes looking well-worn.

I apologize in advance if these turn out not to be ceramic.