i think they are a great idea!
heat is energy and is importatn but STS use smaller exhaust housings to reduce spool up and counter the loss of the heat. also rear mounts dont need to eb water cooled as they run at lower temps and probably put less stress on the oil!
getting the oil back to the engine can be a problem, and some have had pumps fail. but then you could just run a dry sump and run one of the scavange pumps for the turbo! hehehehehehehehe.
Chris.
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