There are regulatory reasons. In Germany all the functional parts of your car have to be certified, often for that specific vehicle and in combination with othe

There are regulatory reasons. In Germany all the functional parts of your car have to be certified, often for that specific vehicle and in combination with other parts. To a certain degree that's definitely necessary. I don't want people downloading bugged amateur software that will make the gas pedal stuck and drive into a crowd because they thought it would give them an additional 5 horsepower. This may sound foreign to the typical American who is allowed to drive around in a rusty mad-max vehicle with failing brakes and DIY body work that will impale any pedestrian unlucky enough to cross its path.