i've had both my m3 E92 -2008 & E92 2010 as well as my 2011 X5m with AA tunes and had zero issues. the E92 is on its 8th year w/ the tune and x5m i got it 2 years ago not for power but to get rid of the cold start at the time for my new born. now that he's 2 and is used to other exhaust i may reflash with the cold start back on
