You could probably do it but i suspect that it would cost ya half as much as a felony. If you did go the route of buying a felony you might want to consider the infraction instead cuz The felony while having a cool body has very specific tire sizes you have to use for the rear wheels so you can't...
I have a feeling youd have to change a bunch of stuff but I can't say for sure. The big question in my mind is "will felony arms fit on the K6 chassis?". If not then you're looking at changing the chassis which means changing the bulk of the car. If they do fit then you could probably get away...
If your talking about turning it full on into a Felony youd have to replace a ton of parts. If you're talking about turning your K6 into something that will tear up a parking lot and drift then you wont need to change nearly as much stuff. Tires/wheels, lower the ride height, change gearing, and...