Hi,
It all depends upon what your objective is. For performance and ride quality, stay with 18's and under. Add to this that Cheating Death isn't an issue with the '98s, but despite those daring few, is a real issue on the '97s (Porsche didn't retool for all that rear chassis reinforcement for frivolity's sake).
Going bigger than 18" is purely for the aesthetic value and braggin' rights. And, if these are your thing - Go for It!...
Happy Motoring!... Jim'99
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