P4S just crushed the PZ4 and new ExtremeContactSport in TireRack test. They mentioned the PSS a couple times, but did not directly compare the two.
New tire looks like a nice option to be sure.
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2012 E88 M-Sport 135i DSB Metallic
COBB CP, ZHP Knob, E60 SSK Lever, E92 M3 FSB, RSFB inserts, Koni Sport, Eibach Pro, UCP, MPSS, AP axle-back, MHD Stage1+ 91
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