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Originally Posted by lakatu
Does anyone know why some "true" hardcore Porsche fans consider an air-cooled engine as the only "real" Porsche engine? Is there some advantage to air-cooling that I am not aware of? The only advantage I can think of is a lower weight resulting from the deletion of the radiators, cooling plumbing and fluids.
I believe though that the water cooling engines allows them to be more efficient at extracting chemical energy from a thermodynamics standpoint. This assumes that water cooling increases the delta T or change in temperature gradient.
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of course i can answer you that question it´s a very simple one, the one and only answer is...
THE SOUND 
it really has nothing to do with power or anything else, it´s just the sound of an aircooled flat six Porsche engine, it´s definitely unique and we core Porsche fans just love it...
you can find a detailed report on that somewhere here in "Pn"...