155 mph!!!!!
According to the Motor Trend mag I was reading today, it is ELECTRONICLY LIMITED TO 155mph. If you remove the limiter........ who knows? 160? 170?
Imagine what the SS would do! Well, the speedo on the SS does go up to 180.
Heres the article:
http://www.motortrend.com/roadtests/...ive/index.html
BTW the Mustang GT's top speed is about 145