Just watched an old episode of Top Gear filmed in Japan. Apparently all vehicles there are factory limited to 180Km/h. That's not too bad (180 is nothing to sneeze at and most cars take quite some time to even reach that speed, if they can reach it at all), but it's still an arbitrary restriction. The good thing is that the Mitsubishi they tested recognized when they took it to the race track and removed the restriction there without any input/action required from the driver.

Speaking of limiters/restrictors, my '01 Sebring 2.7 was limited to about 185. I've hit it only once and never would have found out it existed if I wasn't on a closed course . I have no idea if my current '05 2.7 is limited.