I did my Valentine One V1 installation a few weeks ago, completely stealth with help from Jeremy from
http://www.delonixradar.com.au.
I took his stealth case, mounted it behind the front grill. The cable goes along the side to the grommet which has been mentioned a lot previously, you'll see differnt pictures before and after drilling the hole though the special part. To seal the hole I took a special 'bubble gum' as shown in the picure in black, don't know how it's called got it from the BMW dealer. Power I took from the switched wire (tested with a voltmeter) of the cig lighter as shown in the picture, the cable goes easily underneath the dashboard. I couldn't find a good place for the remote audio switch on/off for the valentine so I but itright next to the leg, not completely hidden but almost. fixed on the carpet with duct tape.