yah if u didnt set the car up on the dyno and program the ecu with the vafc already for those injectors i would suggest going down the oem ones until u have time to do it. otherwise with the same amount of pressure going to the injectors ur going to be pushing a whole lot more fuel causing u to run rich, ur ecu will try to compensate and lower the fuel pressure, but will only do this once its recognizing ur pushing way too much gas.