So far, I don't think anyone has been able to run 11" rear wheels on a Boxster. There just isn't clearence unless you set the ride at at "rally" style. You would need spacers to push the rims out to clear the inner struts, but that would also push the outers into the fender, itself.
I have 18X10's on mine and clearence is extremely tight already.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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