my 4.4i definitely does 140ish..speedo reads optimistic I know..but I was beyond the 140 mark on the speedo pushing past 145 before backing off. Now with my new 20" wheels instead of 19"..I think it can do 139?

What prevents me from attempting this is that I really have a 5,000lb vehicle (with passenger) at that speed....if I strike a car, I will obliterate it...not a pretty site.

I wonder how the Cayenne S does on the twisties?