I was reading on the FFR GTM forum that they are actually building some skid plates to protect the bottom of the car on speed bumps. When set up properly, my FFR Cobra never bottomed out and I don't have my GTR on the road yet to know.
my canam did, not on a speed bump but a ledge from where they where resurfacing the road. I was at highway speeds, right behind a truck so there was no time to react.
I built a defector for the oil pan so it doesn't happen again