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800f is too hot
i would swag that
exhaust manifold temps are too high , can be upwards of 800f under load ,
OEM systems that used to draw hot air from the exhausts had simple bimetalic spring loaded flaps to regulate temperatures to the intake
UN regulated heat from the exhaust manifold is probably not a good idea
hot air from the radiator shroud will never exceed about 250f to 300f and while it may vary , it will be pretty stable at cruise .
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