Watching Ed China replace the pancake airfilter on an old Mustang (Wheeler Dealers on Discoturbo) reminded me that in the bygone era of carburettors, it was common place for the intake to suck in warm air from within the engine compartment and the oem intake could even be rotated to draw air over the exhaust manifold in the winter.
The latest diesels also have controlled intake temperature by bypassing the intercooler at low boost.
In very cold weather I suspect the mpg will drop a lot more if the engine is breathing very cold air and it will take longer for the engine to reach operating temperature. The M47r is an efficient engine and mine used to take 10miles to reach normal operating temps in winter even with the mk2 intake mod.
So, overall, I still feel that my intake Mk2 is still the best option, especially if we are in for another very long and cold winter.
I'd also be sticking some cardboard in front of the rad if I was doing short journeys..
Ron
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