ok i checked out the limits last night. me and a fiend went and i got some info:
two people in the car 550 hp whipple, in first gear stock tires spin a bit but have some tracktion, 2nd gear tires roast all the way to 6000 rpm , slight fish tail, but no problems. 3rd is just g's and wide open eyes. fourth is more of the same and it hits 140 mph in 4th gear and 6000 rpm, gov comes in at 150 mph in 5th
just in case anyone was curious