Yes you can. The 32 bit ECU is supposed to be better and easier to tune. Thats what the turbo busa guys say. If it is going to be a mostly stock busa (pipe, PC, maybe a little spray), than dont shy away from an 02 or older if it is a good deal. The 32 bit ECU is supposed to deliver smoother power distribution, but a good tuner can do that for you on an 02 or older bike too.