Take a close look at the difference in the front upper control arm inner pivot points. The EG has the bushes separate from the upper control arm, so they are much easier to adjust camber with eccentric crush tubes in the bushes. With the EK you have to replace the upper control arm and adjust camber with a sliding ball joint. Much more expensive and not legal in most forms of circuit racing.
The EG lower control arm is 2 piece, so to add caster you simply space the two pieces. The EK lower control arm is one piece, so you can't separate it. That means adding a limited amount of caster with an offset (outwards) rear bush.
I wrote an article for Hot 4's some years back on setting up EG suspension and the ability to enhance caster and camber was the catalyst. I also designed an EG caster kit for Whiteline at the same time. We ran an EG Si hatch at the Bathurst 12 Hour in 1993 for a 3rd in class, so I am rather familiar with that model.
Cheers
Gary



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