I have a 325, but got the Contis as replacement. Yesterday I got a loaner '07 328 with the Potenzas back on, and just going stright down the freeway my teeth were on the edge of chattering from the vibration. So I don't think Bridgestone was re-designed anything. The Contis seem much better in cornering with any amount of road surface irregularity, just because they are slightly softer and will "take" some of that hit.
I still want to get my hands on a 325 with non-RFT, or even just go on a little cruise with someone with such a setup, so I can see if its really that much better.
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