I've yet to do the swap, but comparing parts from www.realoem.com I've found that the E38 740 and E53 X5 use the same brakes. I've went ahead and bought 750iL brakes from a junkyard (calipers, rotors, caliper hangers, lines just in case, pads) and plan on swapping them into the X5. Front brakes dual piston w/ larger rotors and pads, rear gets upgraded from a solid disk to a vented disk.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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