I’ve had my pd130 chipped for 6 months now and recently a whistling noise has started. I first heard it when accelerating hard around 100mph and just thought it must be the wind. But now I can hear it when accelerating hard around 70mph. The revs have to be above 2500rpm and foot near the floor to hear it. I have searched the forum and someone mentioned the dual mass flywheel? Has anyone had this problem before?