I think I wrote this a page or two up. Are the Powerflex going to give you 3-4x the improvement over new OE, or Meyle HD bushings?
I don't think so. Just do OE or Meyle HD. Some have said the benefit to Powerflex is you can install by hand, but you still need the special tool to remove the OE bushings, so its a moot point.
https://www.fcpeuro.com/products/bmw...le-33316770454
BTW! Just saw you looked up the Febi Bilstein bushings on RM European, personally I wouldn't install those. Those are a step down from the OE (Lemforder) and the Meyle HD (oem improved) bushings.