hey guys i have been floating around here for a while now but still cant seem to get a straight answer to my questions. i have been wanting to get a nitro motorcycle for a while now and just recently found out that they even existed. every one says that the Thunder Tiger is the way to go if you are jsut starting out and that is the way it seems, i want to know if this thing is going to be able to grow with me. can i put a bigger mill it in and upgrade it to a point that it is gong to be a farly decent bike? are there many hop ups? the parts would be hard to find here in america as i have never seen a rc bike ever at any store i have ever been to. are there diferent shells to put on it if i dont like the ducati one?

thanks guys