I don't know for certain, but I don't think so. Remember that if it's not explicitly mentioned in your class's rules or those of any lower-prep classes, then it's not allowed. I.e. If it doesn't say you can, then you can't.You can always ask your competitors if they'll let you run an illegal mod, and we tend to be pretty relaxed about it locally, but if you ask for too many you may raise a few eyebrows.