You win plastic trophies, not $$$. Few orgs do have some cash classes but it's not much.People spend so much money to compete in these competitions and only win trophies i don't get why bein 1 db louder than the next guy is so important. Like how money can u win for first place? Would it even cover what u had to spend?
Personally I'd do 3/4" wood in the roof and save the car vs worrying about a class. He'd still be fine for bass racing as that's pretty much an anything goes class...