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It's just turbo fart, you never heard it with the stock air filter because it masks it. My 08 does it too. If it's like mine, when I've got my foot in it, it sounds like a waste gate blowing off between shifts. Actually, that's pretty close to what's happening.
When you shut it down does it sound like a box of marbles as the turbo spins down. Mine does, it's the K&N intake resonating. Sounds like a turbo going south which is probably what the dealer thought too. It's nothing but resonance noise and is typical on the twins from what I've discovered. No need to worry. Just relax and enjoy that sweet smooth accelleration you have now.
Santa Rosa, Ca
08' F350 Super Duty 4x4 OffRoad. 6.4l, Fabtech 6" lift, Procomp 20" wheels/Toyo 37's, K&N Intake. 9" total over stock lift.