You need to be more specific than Michelin Pilots. Tirerack sells 18 models of Michelin Pilots. As far as wet traction, I would have to say he was either asking too much of his tires in the rain or his inflation was too high or too low. Judging that 3 have good tread and 1 does not tells me he had a very heavy right foot. I sold and installed Michelin tires for 5 years a couple of years ago. Michelin & Bridgestone owners normally came in and asked for the same tire because they were very satisfied. Other brand owners did alot of comparison shopping. This is just my observation, not a proven fact.
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator