I am running 7mm & 14 mm front & rear spacers with stock 18's on my Boxster. There was a slight difference on the track that I noticed (positive) and I do get a very slight rub in the back on track in corners that have a bump with extreme side loading on the car (corners 2 & 4 at Mosport for those who know the track). The rub didn't start with the spacers.. but when I added more negative camber it showed up.
Marc
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