what is the benifit of takeing out a D16z6 motor and putting in a D16y7?? i know its supposed to be a jspec motor but with everything i looked at so far they have less horse power, less torque then the z6 motor. so what is the reason for doing so? i only ask this because i might be buying a del sol and he took out the z6 motor and put the y7 motor in it.. input needed please.