well... I'd say my Z is a mid 12 sec car without the 4.08 gears and a very low 12 sec car with the 4.08 gears. Unfortunatly, If I take the boost up and try to get a good run down the strip, my car won't go into gear if I take it anywhere near 6K RPM's or more. The tranny synchros are just dead =( The 12.7's aren't accurate for what it really has in it even with me driving.