[M54ccibo]

Good feedback from everyone. Yeah, the driver's bolt can be tricky, but you shouldn't have to take out the airflow sensor. If you do, be very careful...there were folks who fouled up their E60s when doing this. Better to just run over to the local tool store and get an articulating extension (good info @vic55) or make a tool that fits under the intake tube (mini ratchet, 1/4" T25 bit, and a 1/4" socket, bit taped into the socket). Took me about 20 min total time.