The fastest Boxsters on the west coast are on 17s. The new lightweight Boxster Spider 19s are pretty good and comparable in performance but the tires are 2X the price of the same width in 17 inch and selection of quality 19" tires is still limited. Those drivers that shred a lot of race rubber run 17s for that reason.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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