I bought a used thumb wheel chip from a guy on the board here for 009's. The problem was I found out from a little research that I actualy have 37lb lucas injectors(they look identical to the 42.5lb, but they have a different part number on them). The chip worked good at higher throttle positions and under heavy boost but stuttered off the line. I am sure that the fuel curves are not right for smaller injectors. I also have decided to sell my car. So I have this thumb wheel chip for sale. $100.00 plus shipping.