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Could have a damaged wastegate valve and its bypassing exhaust. If you have a hiss that you didn't hear before, money says finding that will be the problem. All your induction gaskets & O-rings good? Is the turbo inlet restricted? If you still have the air flow meter, make sure the vane is free, or delete the thing and all the EGR garbage. One other idea is seeing if a local shop with a smoke machine can hook up to it and test it for leaks. The shop I used to work at had one and it was the cats meow for finding induction system leaks. Sucks those machines cost so much.
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