If it has not been done, swap out the S&S rectifier for the Harley unit.
Peace of mind.
John.
Do NOT do this on a 2017 car.
My 2016 is perfect with almost 10,000 miles. Have a lust of every M3W dealer with you. No spares, just a cell phone, credit card and a smile. I can spend all day on my BMW R9T, but after a spirited hour in my M3W I need a 😴.