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I put the Bimmerworld, Powerflex RTABs in. I did not use the grease provided by Powerflex. I used a hightemp, waterproof (non-water soluble) grease. No sqweeks, groans or noises. It DOES give increase the road noise from the rear tires. In fact, they allowed me to hear the left rear tire was out of balance. It also removes the swishyness from the rear end during cornering. The car takes a set and stays there....
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