260-265km/hr in my 400hp T/A...
I didn't want to keep looking down at the speedo at that speed, and it was when I had a stock driveshaft on it (critical speed = 255km/hr)
I hope you guys realize that at that speed, you NEED to have z-rated tires, high performance driveshafts, performance brakes (unless it's a long straight road) and all sorts of other crap, or you're REALLY risking your life
