Mike,
any michelin ps4 :

255/55/18 qty 4 or
275/40/20 qty 2 / 315/35/20 qty 2

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2004 BMW X5 >4.4i Retrofit 4.8 Rear Bumper, Extended Flares, 4.8 exhaust ,Bull guard, Blacknight gauge cluster.
2009 BMW X5 >35D -Stage 2 DUDMD tune, full delete ATM catted DP, Midpipes, EGRracepipe, swirlflaps.
Sutphin TCU v3.0 Tune *Upgrade ATM FMIC
2005 Audi A4 B6 GIAC Stage 5
*to be installed