I have heard DPFI setup gets a better gas milage then the MPFI setup..if you are worried about gas..but as for power you will feel the diference if you switch to the MPFI..It is not that hard of a swap or expensive..just go On e-bay and find the manifold..and then go to a junkyard and get a resistor box..you also need a new dizzy..so depends on what you really want..put a intake and a catback you will also feel a difference too.