They are very useful, pre-heaters. I use a coolant heater mounted in one of the core plug holes to pre-heat for a 2-mile commute during the winter. There is also a cabin heater to pre-heat and defrost the car so the engine can warm up more quickly.
Next mod would be an adhesive oil sump heater, as it's surprising how long the oil takes to heat up. If I ever get round to putting an undertray on, I am seriously considering using it to help duct hot air from the radiator to various other places on the car. Especially to the shock absorbers, at -25C they make the ride unbelievably crashy.
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