There was a thread a while back about some of having an issue with the DSI clucking back to start position some time after the engine's been turned off. Thinking about it, doesn't that mean it also doesn't work properly at speed (5 or 6000 RPM)? If I understand this correctly, the DSI is in the short position (least restriction) when the car is off. When it's started, it stays in this position until it's running and then switches to the long path position until 5-6K sepending on your computer ROM version. Comments anyone?