I put these ones in the front (amber turn signals) and they work great. There is no DTC ("error") message reported, so they function just like normal bulbs. I wanted to try them as a test before getting rears and they definitely passed. Haven't bothered to get rears yet though.
Eventually that link above will die, so for future reference:
Item title: TWO AMBER No Resistor Required 7507 BAU15s PY21W 20-SMD LED Lights
eBay seller: maple125
2011 X3 (F25) xDrive 35i 3.0L, nav, xm
Last edited by SpaceManGray; 11-02-2012 at 04:04 PM.