I’ve had the PowerFlex engine mounts installed for six years now (added them when the RBs were replaced). Supposedly they raise the engine by 0.1-0.125” but I’ve had no rubbing issues with my Karbonius plenum. As for NVH, the PF mounts on its softest setting added virtually no NVH. Only time I feel a small increase in NVH is during a cold startup. I’d strongly recommend them as a solid option over stock, vibratechnics and AKG.
https://www.bimmerworld.com/Engine/E...46-E9X-M3.html