For what it's worth, I had it on my old 4 cyl. Jeep YJ. I had the whole MSD computer and Blaster2 coil. Along with super low restriction wires (ACCEL 300+) it had really improve the performance.
The first problem here is that you posted this question in the Discovery2 forum, and that the second being that the Discovery2 does not have a coil. And nor do they have leaf springs
