You could add this to your X5 35D and pick up some healthy torque. http://www.burgertuning.com/BMW_JBD_...ance_chip.html
A friend of mine has same car and loves it with the chip.
Audio: Jehnert Flatline speakers, Mobridge M1000 DA2 prepro, Helix P-DSP, Zapco Z-150.6 amp
Performance: Cobb Pro Tune, AR Downpipes, ER FMIC/CP, DCI, RB turbos, KW V2 coilovers, Fuel-It Stage 2 w Ported fuel rail, Mfactory LSD