when i had the t28 on my speedo would be pegged very quickly, i was paying attention only to the road when i hit 5th gear and ill tell you what it wasnt long after that that i hit my rev limiter in 5th, it happened sooooo fast. 7750rpms in 5th with the little bit taller tires on there is probably around 160-162mph or so, the car with all the suspension i have done is incredibly stable at those speeds. It hugs the ground and doesnt really vibrate at all. Again once i hit 5th it didnt take long. I did it probably less than a mile long straight before i hit the limiter. Did it with the t25 on there too, took a little longer but still hit it fairly quick. If i had more gearing it would have kept pulling hard as hell.