People are somehow prevented by law to modify their car from hardware to software already. In most countries, changing your intake or doing an ECU remap is less

People are somehow prevented by law to modify their car from hardware to software already. In most countries, changing your intake or doing an ECU remap is less dramatic than bolting on a turbo on a NA car but it is nonetheless exactly the same: your car is no longer complying to characteristics from when it was homologated. Therefore if you do so you can basically only drive it in your backyard and not on public roads, unless you take on you (and your wallet and patience) to have those modifications homologated as a special case.