Smoke test revealed air leaks from bank-2 of the intake manifold. The DINAN-5 Supercharged 540i would occasionally choke under throttle or stall out when at idle. This has been a tough problem to find.... I'll have the team replace the intake manifold gaskets and secondary O2 Sensors in January.. Hopefully the Mass Air Sensor is good... I'm excited to put this problem behind me and get back on the track!