As we've mentioned. Give BAT an email and see what they say. They'll have much more info about what has been or might sell for more than market value dictates. That's what they do all day. We had a couple members contact them with low-mileage 4.8's/4.6's and were turned down but yours has an extra bit of flair with the MT and boost.

E53's are just not that hot yet in the enthusiast world yet... and, though slowly heating up, the ones bringing $15k are low mileage 4.8's and 4.6's. Yours could definitely be the exception being an MT and boosted reliably. Please keep this thread updated with what you get for it. Definitely wish you all the best with it and hope you get all you want. If you just dropped $10k into it, might be a good time to enjoy it and let the market rise?

BTW, I had that exact boost gauge in an E30 turbo 318is. Very cool looking gauge.

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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)