If money is a concern, then my friend you picked the wrong platform to start with. Modifying a rotary is ALWAYS.......VERY expensive. There is no way around it, and to get into the 10's in a RX-8 on a budget well....we all have dreams. (Not sure if thats what your going for.) You can drop $4000.00 on a Greddy Turbo Kit and add exhaust and that will net you some fun, but then again, I don't know if you want to spend $4000.00-$5000.00 on a turbo kit and exhaust.