At the time I had a 1989 XM 2.0, but at various times I've had a couple of CXes, several XMs, a couple of GSAs, a BX briefly, and an AX GT.
One of the XMs was the 3-litre 24-valve one which would sit comfortably at twice the legal limit, with the only real difference being the stereo had to be a couple of notches louder and the trees and road signs came up twice as fast. Oh, and the trip computer showed an astounding 8MPG - you wouldn't be doing 147mph for long because you've got less than an hour of fuel in the tank at that speed.
The AX GT was the carby one, basically their 950cc hatchback with the 1.4 out of a BX dropped in and a lumpy cam and twin-choke 2x32mm Weber carb. It was a little pocket-size tin of hooliganism.
The CXes were probably the most refined of the lot. Look up DIRAVI steering - fully powered, no mechanical connection between the steering wheel and road wheels when it's working normally.