Not sure about FFTEC, but GST is in Hayward. FWIW the GST Mustang dyno has a reputation for being one of the lowest reading around. Not that it's a bad thing, but it is seriously known as a heartbreaker.
They are a pretty decent shop if they can fit you in. Had some good dealings with them in the past with my WRX, as that is their primary focus. Not sure they deal much with BMWs, but should easily be able to do baseline dyno runs.