JWT program for 720cc injectors is even more rich than the standard programs... richness has nothing to do with the size of the injectors...it's how much fuel is being supplied... the extra amount of fuel being supplied (also a decrease in timing) is part of the JWT 720cc code. If they didnt make it so damn rich then the 720's would not cause nearly as many problems as they give people already. I bet a Z with 720 injectors and a properly tuned Link EMS would run very well.