Ah! One of the reasons I’m sticking with the stock chargepipe lol, see this happen weekly to people
I’d try to hook it with a coat hanger, then hair go for removing the skid plate and grabbing it by hand
I had the same thing happen when I replaced just the rear tires as well, only on freeway above 70 or so. Went to 285 on stock wheels. I chalked it up to new tires breaking in, eventually stopped after a few weeks of driving.
Sounds like it a characteristic of the speakers. They are shit, mixed with shitty in cabin acoustics, the buzzing happens. I’ve got a few songs that do it on demand as well.
5W-30 is perfectly fine. I’d bank there majority of us that are modded have switched to thicker oil. Stock stuff is water.
Also no need for any fuel additive.
Glad you got it goin. But yeah, all bimmers are like that. Low battery causes all sorts of shit. Should clear right up when you get some decent charge in it.