
I don't think that argument is gonna work for him...
Dusstbuster: Awww, but geee Mom, race cars have lowering springs so why can't I?
Mrs. Dusstbuster: Now Beaver, race cars also have roll cages, do you need one of those too? Now, run along and play, your father will be home soon...
No offense intended, Dusstbuster

, but, guys, he lives at home, under his parents roof...you know, where you have to live by their rules...
My advice...save your money and move out ASAP...then you can do whatever you want. How old are you Dusstbuster?