I don't know what an MS8 is, but the CleenSweep basically takes all the OEM audio signals (Radio, Sat Radio, Nav, Bluetooth, etc.) and outputs a cleaner, flatter signal before it goes into the amps. I still have OEM volume control for everything and didn't have to worry about what kind of outputs the factory system has. Especially useful since everything runs through the iDrive...
COBB Stage 2+ AGGRESSIVE / STETT Cold-Air Intake / STETT Charge Pipe / TiAL Blow-off Valve / ETS 5" Front-Mount Intercooler / Active Autowerke 3" Catless Downpipes / Active Autowerke Signature Exhaust / AST 4100 Coilovers / OS Giken Superlock LSD / All MOTUL Fluids