Celica Forums General Discussion Engine and Performance Fire heated exhausts

I'm talking about that look that some exhaust systems have, which looks pretty cool. Like the metal is heated, the rainbow effect. What's the name of something like this? How do they even make it like that? Is it an effect that's painted on? Or is it heated so it has that color somehow. How do they make sure it stays like that for the life of the exhaust?

the metal is titanium... when heated to high temperatures the metal turns this rainbow color

Veilside, Tanabe, and Trial are the only companies who make titanium exhaust systems for the Celica. Each one is in the $750+ range.