I just don't see the value in taking a 3.0 to a 4.4? Maybe a 4.6 or a 4.8 would be worthwhile... but again the expense nullifies most of the "cool" factor in my mind. Sorry to be negative, but I'd definitely pass.

Might buy them to part them out and make some money though. But I don't think that's an option in your case because you mentioned the lack of a workspace.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)