REFLECTOR: ceramic coated exhaust pipes

[Tom]

Al, there are some advantages, particularly for those with updraft 
cooling. You're correct about the outside coating not doing much. A 
good, inside coating is needed which only a few places do well. I've got 
the short stacks from Velocity and since they slip apart, they were able 
to get a good coat on the inside.( Jet-Hot) I did gain over 100 static 
rpm after install but I believe that was mostly due to the exhaust 
system change. It's definitely cooler under the cowling, cooler CHTs and 
less risk of heat damage on tightly closed cowlings. I can hold my hand 
on the exhaust shortly after shutdown.