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- -- 03 P5 / 23 CX-5 --
Except for the header being ceramic coated and more of the heat goes out the end of it than up into the engine bay. They also have air moving over them when car is moving more than being buried in the vc.........They can also be mounted elsewhere in the bay.Cool. But does moving the coils off the top of the motor have any benefit? I'll have a guess an say it's to do with heat.
But then that picture shows the 1.8 coils mounted on top of extractors, which would be far more hotter than any valve cover/cylinder head.