Robert Lilly wrote in part 
>Another benefit is that the exhaust will work better because hotter gases
>travel faster and create a higher vacuum pull on the intake and pull more
>fuel into the chamber and increases power.
>Back pressure is also reduced and power is increased because the engine does
>not have to use as much HP to force the exhaust gases out.
>Intake temps are reduced and because "colder" fuel makes more power, HP is
>again increased.

The hotter the exhaust gas is the more it expands and that makes the exhaust system less effective 
 some boats with V8s use a water cooled exhaust that greatly increase power output  
intake manifold temps are directly related to exhaust temps as they go up the horse power goes down. 
fresh air to the engine compartment and to the air intake manifolds are a great way to keep the intake system cool I used this to prevent power loss as the engine compartment warmed up after a couple of laps in my formula vee http://www.bostonengine.com/images/gallery/be-joeracer.JPG] 
the Bergs offer ceramic coatings that coat both inside and outside of the exhaust system this would prevent the pipe from absorbing heat. ceramics may also be very good at giving off what heat it does absorb
B. Bob 

[text/html]