Nope no tune, guy before me just has the RPM dual cone CAI, no other mods as far as I can tell. MAF looked pretty new, I cleaned it up anyway but same result. Adjusted the wastegate, same deal. I keep monkeying around with the throttle body elbow, I think I am going to replace it and put on upgraded clamps, has the originals on there, wonder if they are the leak.
Car seems to be holding boost fine, it happily gives me 15-16 psi and seems solid through the power-band. Just after 40 or so miles the ECU throws the code and cuts down the turbo. So it makes me think it is more sensor related than a physical leak, not sure it would hold 16 psi fine and be leaky.