We are looking for someone who has a 535i and is interested in trying out our Stage 1 tune for the N55 motor. We have it nailed for the M235i/335i/435i cars but we just want to verify results on a 535i. You can check out the thread below on the F30 Forum. We need your car for a few hours to do baseline dyno runs and post tune runs. You then drive the car for a couple weeks and provide your feedback. At that time it is your call to keep the tune or have is flashed back to stock. Cost for your efforts is $0. PM me if you are interested.
http://f30.bimmerpost.com/forums/sho....php?t=1127662