^Correct. That is the aero kit. The one I am running on my 4.8is (ditched the 4.8 kit). I believe the aero kit front fascia is lower than the 4.8 (or more forward and lower) so maybe that's the reason? Don't know. When I find a truck with on (aero or not) and pick it up I'll be sure to follow up. Still sucks there are 2 versions.

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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)