2019 update:
i got the manifold back from rich (505) in december of 2013.
a year or two ago, i noticed i wasn't peaking 26.5 psi anymore. did a boost leak test and the car was barely holding half a psi, but i didn't see anything obvious. used a smoke leak detector and found this.
not sure...
i have 205/40s all around. the rear is stretched more than the front due to different tires, rear fenders are rolled and front is cut near the bumper tabs.