The centric ring arrived Thrusday afternoon, and I got them installed today. Its hard to believe how sucha slight piece of metal can have such an effect, but they certainly cured the problem. Bonnie is flat smooth all the way past 70-75mph.

The Michelin Pilot Sports also arrived and I couldnt be happier with them. I think what Rook had suggested was the source of this set of tires as two appear to have some scrub marks on the outside treads as though the car took a hard slide...otherwise they are flawless. No patches,plugs or scuffed sidewalls, and plenty of tread left. Hopefully I can get the tires all swapped around this coming week, then both of my cars will be happy