You probably have one of the most unique set-ups in SoCal w/that shortbed! Parking my longbed is an ordeal sometimes, but I need the extra bed length for hauling gear. I put in a pioneer AvicD2 nav w/back up camera, pioneer 6cd changer, better speakers and a powered sub. What a difference. The back up camera is very cool. It makes for an easy hook up of my trailer too. Don't mess w/the intake or use a programmer though. I've heard many horror stories about blown engines and torn up turbos that were denied warranty coverage because of aftermarket parts. One thing you might want to add are the tire valve extensions for the rear dually wheels. I'm talking about the stainless steel braided hoses that extend out to the hub. Try adding air to the rears w/o them and you'll understand.

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'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4