It's just fine. I'm the last person to ask about sound system quality, as I just listen to the radio or the exhaust. Had HK in my last car and didn't really appreciate it, plus the speakers would rattle on it.
E82 '13 135is
- Space Gray/Coral Red, 6 MT,
Heated Seats, 50% tint, clear bra, BMW Perf. Grilles, BMW Perf. CF Diffuser - #180/613