No, I'm running stock N75. N75K is still in an unopened box.
By hardcore, I mean that the overboost is higher. So if you spike with your stock N75 lets say 1 bar, with N75K you will spike 1,2bar or so. May be kind of cool, but my K04 Sportec software spikes up o 1,4 -1,5 bar by itself, so...