The reason for the fan is to provide heat to the windshield at idle. For those who don't live in cold winter climates probably do not understand the reasons for it and consider it a mistake on Porsches part.
Those who live in cold winter climates and drive their care all year understand the fan is required to defrost / defog the windshield while engine rpms are not high enough to push air and is an obvious safety requirement Porsche had to address.
But if you don't need it knock yourself out.
This also has NOTHING to do with SSIs or back dated exhaust, As you can see the SSIs route the cabin heat ducting exactly the same way.
carry on