I've had mine up to 140, and it was still pullin when I let off, so I'd guess 150-155 is totally reasonable. It's hairy up there, you want a perfect stretch of fairly fresh pavement and no traffic, but I wouldn't really urge anyone to do it in a stang. Years back I would've done it just to tell my friends, but I'm a little wiser now. In a Z06 or something it's not as big a deal, you can get up and down from those speeds quicker and it's a hell of a lot more aerodynamic and stable. I'd just hate to see someone on here hurt themselves or someone else for the sake of a number, so be careful, folks.
-Chris