Don't forget variable cam timing on the intake cam. The intake manifold has variable runner length to opitmize low end torque. Different designed head. Getrag 6-speed tranny. Larger brakes and 4-wheel disks. "Sport tuned" suspension. High flow cat.

But the reason those things are so damn slow is the gearing in the transmission. Regular ZX3's running the same sort of power with the regular MTX75 5-speed are much quicker. I imagine just ditching the Getrag in the SVT would improve that car quite a bit.