As far as classing goes, with the NCCA its not based on the ammount of mods you have, it based on the exterior mods.
For example, not many people will roll a car daily with a full grafter widebody kit, they would go wild. a bolt on full kit, mild, lip kit (mintblue or autoexe lip) would be street. It does not matter that you have a full engine build, with turbo, you got nothing but a lip, your street class.