[Grimeton]

Because everybody is fighting over legal/illegal tuning:

When you just change your software and you gain 50bhp that DOES NOT make your car faster. The gears still have the same ratio and the maximum speed doesn't change because the engine went up to max rpm at 200bhp and now goes up to max rpm at 250bhp.

Even raising the max rpm won't get you anywhere because to go from let's say 6500rpm to 8000rpm requires so much power and modifications that you won't achieve that with software alone.

So as long as only the software is changed the maximum operating parameters of the car are NOT changed.