It has to be at least over the stock PSI level then to over step the factory recommendation. Ya think? And if this is an issue why hasn't anyone done a write-up comparo yet? I remeber reading many posts on comfirming that it is a good recommendation to keep the stock size. Has this changed in the 6mos i have been gone.
PS- Congrats on the shop car article in the April Sport Compact Car....bought it....read it....liked it. Good job on the Z.