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You really don't want to cool the exhaust flow, as more heat - higher pressure - faster velocity - more scavenging from engine - better Volumetric Efficiency.
Therefore, insulating the exhaust from cross-flow and direct air contact would be a good idea.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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