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The car came with a K&N so why not re-use it. The MAF was surprisingly clean but I cleaned it anyway. I've used K&N filters on Fuel Injected and carbureted engines for years including all of my current and past off road sand cars. I've dug into the engines of all my cars and saw no evidence that K&N filters are detrimental in any way conversely a friend insisted on using a paper air filter on his Subaru powered off road car because "If Subaru used it, it must be good". After a season or two, he lost compression and when I dismantled the engine, it was full of sand. Never saw any sand inside any of my off road engines.
If you seriously believe that Porsche knows it all and therefore you should only use their filter then think about all the things Porsche has done wrong namely the IMSB and RMS issues of late.
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