132 in my 1975 280Z and it was screaming.
145 on a bike

To be quite honest, I have no idea at what speed my X tops out. I think I've only had it up to 80 while passing a couple of times. Here in New York we drive rather tame on the highways.

The governor removal question is a legitimate one for people who are trying to pass, only to have their engine lay down on them with traffic comming.

I would say go find yourself a computer-goober who knows how to reprogram eprom chips.