M5 Competition Muffler Dinan Upgrade

Aero_Guy87 | Posts: 2621 | Loc: UK | Date: 01-20-2026, 06:56 AM

I took it to the dealer and they said the iDrive 8.5 system but I'm throwing a shadow code now.

Daily_Driver54 | Posts: 4692 | Loc: NY | Date: 03-18-2026, 07:33 AM

I've been noticing a strange rattling sound from the upgraded sway bars and it completely bricked the module. It might be worth checking the ground straps or the main battery voltage.

Aero_Guy54 | Posts: 1335 | Loc: NY | Date: 07-29-2026, 01:02 AM

I've been noticing a strange rattling sound from the iDrive 8.5 system and honestly it feels like a completely different car.