It's a common problem - young lad wants fast car but cant insure, so gets a cheap car to insure and then puts on all the bits to make it look fast / go fast.
I know I wont change your mind, but you will need to tell them about you putting the bodykit on also as this will affect your premium / make it void if you dont tell them.
I know it sucks, but you will be fooked if you get found out!