Originally Posted by duke10
That's why they make the iDrive controller plus you shouldnt be messing with the nav while driving anyway. I would never install those type of kit on an M3. but then again, to each his own.
OP, it'd cost quite a bit to retrofit the OEM Nav into your car. I looked into this a while ago and the cost wasn't worth it IMO.
He said he wants a "custom job" so I'm pretty sure he's not talking about a retro fit or oem.