Lots of drivers AX their Boxsters with 17x8.5 wheels and 255/40/17s on all four. Plenty of grip and if you understeer now you are simply apexing too early. Any obstacle can be overcome. It just depends on how much $$ you want to spend.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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