I just bought a 2004 GT3 on Friday. I am having Michelin Pilot Sport Cups put on this week. I have these same tires on my Boxster S as well.
Labor Day weekend, I was driving my Boxster S at a PCA DE event at Road America in Wisconsin and met with a Michelin tire engineer who was there. He told me optimal hot pressures on the PSC were 32 psi front and back.
I see a number of you recommend higher hot tire pressures for your GT3s with MPSCs. Perhaps the engineer's recommendation was specific to my Boxster S, but I suspect not. Can anyone elaborate as to why you like the higher pressures?