Cool carputer .. i did one back in the day on my kia sorento.. Hey goto mp3car.com
there are tons of carputers there. do a search for BMW, X5,e46 and carx also they have dc to dc powersupplies that work off the ignition.. I have heard good and bad reviews with inverters. I used to the DSATX 200 watts. turn the key off p (not mac) went into hibernation. Heres my old install http://www.sorentosite.com/forum/sho...d.php?tid=2934

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up