My 1998 came with 16s originally. When I started performance driving I mounted a pair of 17s so I could max my tire widths for stock class. I think the widest recommended tire on a 16x7 wheel is 225. Otherwise the car handled just fine with 16s and tire costs were less.
16 wheels are the trick setup for a base Boxster with snow tires because the larger sidewall gives better pothole protection, 16 snow tires are a lot cheaper and a narrower tire actually offers better traction in the snow.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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