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Here is the description of the changes they made in '98 models
to correct the problems that exhibited with spirited driving with wheels larger than the stock 16" or 17" option in the '97.
18” wheel option with rear chassis reinforced to accept new wheels. Rear body structural change included redesigned wheel wells and coil spring mounts, lower engine compartment bulkhead, rear wall cross-member and rear axle mount reinforcements.
It could be that the basic body structure that the rear suspension is hung from has deformed and is flexing and thus throwing the suspension geometry off and you are essentially dragging those rear tires across the pavement and abrading them to death.
Good luck. And there is no way I'd drive it before a true Porsche expert tells me it is safe. I've been driving a car watching through the rear view mirror as my suspension parts bounded along behind me off the road..it isn't fun...or safe.
BTW, one of the downsides of 19" tires is cost.
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