Rule 1
Be Polite FFS it upsets them more when you dont bite

Rule 2
Wouldnt give it 100% throttle for anybody. Let alone let him do it in my car.

Rule 3
Dont run stupid number plates on the back of your car.

Rule 4
Exhausts probably got a number on it saying its legal.

Rule 5
Dont worry about it. He did nearly everything wrong, so it wouldn't stick in court.