My brother and i are looking at getting pit bikes. I wanted to get a 110 and he wanted to get a 50 and we would trick them out. But We arent sure if we should get those or bikes that are already ready to race such as SDG, pitster pro, or THumpstar, etc. I dont really want to spend more than 5K on the bike so should i get the 110 and do work to it or would an SDG 125 be just as fast without the work? Also i need to know about sound seeing as i dont want to disturb the neighbors, which would be louder a tricked out 110, 50, or SDG. I need the quietest one i can get with a good amount of speed.