F50 question

I realize that most ppl would not DARE touch an F50 save maybe a tubi, but still, I have to ask, we know that the GT1 was made, (not sure by who, michelloto?), has anyone done these upgrades or any others to the F50? I know the Koenig was turbo'd, but I meant maybe a remapped ecu, air filters etc... would be interesting to see 600 HP even.