i've hit the speed limiter many times in my mystique, it's the V6 so its not hard it'll get up there in no time there is soooo much left in both the duratec and zetec (i've got a focus ZX3 with the zetec also hit the limiter in that car a couple of times)
both at approximatly 110mph in 4th gear with somewhere between 500 and 800 revs left with both cars. the zetec focus takes a little while longer that the v6 mystique