Yeah, I fell for that "upgrade" sound on my X5. "DSP", what a load of CR_P! My parents reverb setting on their 1950 wurlitzer sounded better. Don't get an upgraded stereo on ANY BMW product unless you don't care about sound. Money is better spent on aftermarket solutions.

In the US, modifications to the vehicle do not void warranties unless they can prove that the modification caused the warrantied part(s) to fail. May be similar in UK.

Also, BMW has taken to using coax connectors for all signals to and fro in the sound system. I hooked up my CD changer in the X5 with one tiny little coax connector and it handles both control of the cahnger and the sound, so unless your a sparkchaser professional it's unlikely a DIY project for integrating an EMPEG to factory radio. I planned on ditching my factory unit and going totally aftermarket.

THere are some interesting hacks into the BMW system that allow aux input but not truly integrated stuff.

I'll keep you posted when I get my Mini S!!