That's a problem for law enforcement and MOT inspections. Young people notoriously tune scooters and minicars already, there's absolutely no news there.
Penalties will take care of most of the tuners. For exampple, if you get caught with a disabled speed limiter you will have your license suspended for two years and your real full-power driver's license postponed by two years. Also insurance companies will impose hefty penalties if you're driving something else (more powerful) than what you've insured. If you crash, the insurance company will be charging you for the damages.
Here's a light-weight minicar after collision: https://is.mediadelivery.fi/img/1920/2965ca321c7a47758ca5a81... -- I'd rather have my kids take that hit in a passenger car, even a small one.
