I have the same problems that people are experiencing with slack in the coils when the suspension is unloaded.
I've so far only found eibach and hypercoils that make some.
It's basically a short 3-4" spring that is placed on top of the coil. When you hit a bump or jack up you car, the small spring that is a light one (you can compress it with your fingers) takes up the space.
Any feedback or URLs would be appreciated.
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Michel
My life is crap
http://www.azur.qc.ca/rallye