EV tuning is still in its early stages. Some companies offer throttle response mods and power unlocks but its not like ICE tuning. Give it a few years.
There are a few companies working on EV tuning. The main things they can do are: remove the speed limiter (250km/h to unrestricted), adjust throttle response curves, and modify regenerative braking strength. Actual power increases are limited because the motors are already running near their thermal limits. Its a very different world from ICE tuning.
The i4 M50 already makes 544hp which is plenty. The real tuning potential for EVs is in the software - things like launch control optimization, torque vectoring adjustments, and one-pedal driving calibration. Physical mods like lowering springs and wheels make more sense on EVs since theres no engine to modify.