My old '94 TBird had a fuel cut off/governor set at 115, and when I switched in a .373 rear end the something got messed up and it changed the top/cut to 85mph. It sucks on the highway, because she's fast for a basically unmodded heavy b**** V8, but when you think about it, why would you ever need to go over 85mph in a 4000lb heffer like that, in any car basically. Fun, yeah. No other reasons that are legal.