Those look slick... 0.4944 is decently good for a ~300w 10" sub. I wonder what the max top mount depth is. Stuff some polyfill in there and your sub will sound even better. Might have to consider this...

hmobe53, any other details you can share about it? Does it come with that nifty looking grille?

Edit: How much was it to get it to the states from the UK?

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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)