I have been following the MAF testing threads as well as the MAF group buy threads, and have a couple of questions. I tested the MAFS as outlined in David's post and saw 91 l/h in 2nd gear at the rev limiter (raised w/ Dinan software). My 5 has 51000+ miles, but I have a third party "platinum" warranty (Mercury/Corpmsc/AAA) w/ no deductible. There is no SES light, and the usual "grunt" does not seem to be noticeably decreased. How can I approach the BMW service advisor about a possible MAF failure to get them tested and replaced ? If I tell him I did the fuel flow test, will he hold that against me? I realize that the MAFs in the group buy are fairly inexpensive, but I did pay a good penny for the warranty and would like to take advantage of it. Thanks in advance for any advice.