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I have stage 2 it's great. I'm curious, what was your code issue. What was the resolve? I'm throwing up a 102302:
Hot film air mass meter, operating range: Period duration too low, air mass too high. Terry says it's the MAF Sensor. They had the issue on the test 2011 550i and it solved the problem. I ordered one and waiting for it. Didn't want to pay BMW $400 for one. I hope this is the fix.
