A probe with those mods will be comparable if not, a bit quicker than a stock CSVT. Although, the difference between an ATX and MTX will make a world of difference. The 4EAT sucks a nut. What type of transmission does he have? Those mods should net around 150-160 HP at the wheels, with matching torque. How do i know? I had the exact same mods on my '94 GT, and it was dynoed.
From my expereience, the probe is MUCH easier to launch.
