What I was thinking is sort of similar with the following exceptions- two
exhaust runners joining into one 31  inches back from the exhaust ports,
using one of those stainless exhaust bellows to connect to the perforated
pipe. The holes in the perforated pipe would be louvered to face the rear by
putting a rod into them and bending them. That way they would scoop into the
exhaust flow and scoop the flow out of the perforated pipe. The perf pipe
would be surrounded by a 5" dia pipe that was open on both ends. The forward
end could take air out of the engine compartment or the heated air from the
radiator, if care was taken not to radiate heat from the exhaust to the rad.

My  2 cents.
Brian Trubee

 
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