I have vibratechnics gearbox, front and rear fast road engine mounts. It does make the cabin noisier at the idle. However my exhaust is fouling on the rear beam and my rear springs have colapsed again so this may be exaserbating the affect. One thing I say is that when you switch off the engine the whole dash shakes and I get the impression that the vibration to do that came from the engine and through the chassis legs. In terms of engine throw, it definately cuts it done considerably. This is on an AHU engine cordoba vario.