Have you verified the flow of the injectors by looking up the part number? Is there any bends in the piping between the MAF and the charger? Just to verify, the MAF is between the air filter and the charger, and not between the charger and the throttle body? I will be honest I have no idea what the flow of a injector even means? There is a 90 degree bend from the inlet of the charger of which has two inlets on the bottom of the pipework for the recir valve return and crankhouse breather. I will upload some pics in 5 mins to show the setup. The MAF is between the air filter and the charger on