Quick update, my fuel economy has gone up noticeably. I was only getting about 18-18.5 before, and I'm now settling around 19.5-20.0 as reported by the dashboard computer. I have a pretty regular drive to work and back, short city drive. It is anecdotal, but is a trend over a almost two weeks now.
I'm going to flash the Cobb Sport tune in the next few days and see if the misfires are gone. If that goes well for a while I'll bump to the Aggressive tune.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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