I'm considering doing all the powerflex inserts as I think* my mounts need to be replaced. At least one of them definitely does. My question is, well my three questions are, (i) If I think my mounts are shot, should I replace them in addition to installing the powerflex inserts. (ii) I have a 06/03 build date base Cooper, which from what I understand has a solid rubber mount as opposed to the oil filled mount. How is this effected if at all? Finally, (iii) Is there a noticeable amount more vibration with the powerflex inserts? Thanks fellas.