yes, you probably will get bumped up at least into a street touring class. and a street mod class is gonna be one of the more competitive if not the most. in our street mod class you can basically do anything to a car you want, which includes engine swaps and big power adders like forced induction. other stuff includes completely custom suspension set ups made specifically for its purpose. street mod is not a beginners category. running your car in stock form wont do much damage to the car other than quicker tire wear, unless your car has been subjected to alot of rust damage, in which case i'd keep a close eye on things like shock mounts, sway bar links, a-arms... that type of thing. last event a friend of mine actually broke an a-arm on his saab because it had rusted and pitted so badly that its structural integrity was out the window. but aside from freak occurances like that you probably wont experience much wear and tear, other than tires, and even thats not too bad.