remove diseasal engine
fit 6 cylinder petrol
fit supercharger
job done
seriously, b&w london can chip cars anywhere in the world without touching your car, guys name is Jason , he does it online somehow .
go to www.x5drivers.co.uk on home page , i think it says mods or similar, you will find it .
he has website and phone numbers listed there .
let us know how you go .