2nd Gen. 1&2 Series (2011-2021 | F20,F21,F22,F23)
I had a new chain and battery fitted around 4 months a go to my F20. Prior to that, I upgraded the head unit, had it coded and replaced the NBT emulator. Since then, with the exception of the front passenger speaker intermittently not working, it's been absolutely fine.
Went out this evening...