My understanding is that ceramic coating a header and pipes also improves gas 
flow velocity when coated internally, as well as reducing underhood temp and 
corrosion.  Looks, durability, performance.  For the money sounds like a 
no-brainer...
> 
> I could be wrong on this, but I had always thought that the purpose 
> of the ceramic coating was more for thermal reasons than 
> anti-corrosion. Keeping heat in the exhaust helps with scavenging, 
> from what I've read.
> -- 
> Phil Barnes (peb3@cornell.edu)
> Cortland, NY (nowhere near New York City)      
> '71 TR6  CC61193L (26 year owner)
 
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