My first hit of speed over 125 was in my 2006, 4.0 V6, a very fast and smooth trip. I don't dare do it again as the stock drive shaft may not handle it again. (they have been proven to fail over 120mph) I take it to 110 from time to time, but only when and where I know the cops are not around. The most fun though, is running fast laps at Watkins Glen International. Its not always high speed, but it is challenging.