For all you dip****s saying the stock charger is the problem, This is why you go with a good Tuner. I'm guessing the OP told his tuner he has a stock charger since he had his chip reburned for the larger injectors. The TUNER should pull back fuel to make it almost smoke free. This is the beauty of an electronically controlled engine. Now with all that aside, I'm not saying there isn't a boost leak or some mechanical problem BUT just because it has a stock charger doesn't mean it shouldn't run clean with bigger injectors. Hell you could make 400/400s run clean with a stock turbo if so desired.