I agree with you scourtaud23, i forgot about the stealing part , as for nitrous kits its aginst the low in here apperntly, a supercharger kit from ess is there it costs 11k.
Buying and fitting a motor of 4.8 new x5 m series will cost 13k, and naturaly i would assume that my engine will need a whole new sets of pistons, pipes, reinforced gasket and other thing to withstand the turbo kit, so that will be around 17k project.