Hi, Rich and Janet Bentley here. Am new to the club. Bought a 2007 Z4 a couple of years ago and really enjoy driving it. Have just over 18k miles on it and took a nail in one of the tires. Decided to replace all four. Abandoned the run flat tire for the Michelin Pilot Super Sport. I have to say that the car really came alive with the Michelin. Quiet, smooth, and road holding that seems superior to the Bridgestone Potenzas. The car no longer chases irregularities in the pavement, especially under braking. These tires generally inspire even more confidence than the Bridgestones. The question: Should I modify the tire pressures from that recommended for the run flats (35psi front, 37psi rear)? Has anybody else made this change? And did you find a better pressure to run these tires on? Thanks!