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I installed the stage one tune on my wife's 230i. While the performance is better than the Sport model I first tried, I have noticed that the engine surges when under light (normal) throttle steady state cruising, particularly when under a light load such as climbing a hill. At around 2k RPM the engine loses power then the power returns and the same thing happens again. There is a drop then a gain in of only a couple hundred RPM. The car is fine without the tune. I am convinced that the tune is not optimized for the B46 and Dinan should revise it. I checked here first before calling Dinan. It looks like they don't care.
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