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This may be old news but I got an email from VANSTEEL about their coilover conversion for C3's. I haven't seen any threads on it so maybe it is old but it was the first I had heard of it. $1200
Depends which part you want to convert. The front or the back? The front has been available for awhile and you can either just stick with your stock a-arms and put coil-overs in or buy special lower a-arms and put coil-overs on those to take full advantage of em.
Now the rear is trickier and speed direct and vansteel will have some systems out, if they're not out already, to convert back there.
Just be forewarned if you use either of the rear coil-over systems they offer, and you autocross, that you'll be knocked in to a "prepared" category where you have to race against cars that have everything gutted out of their cars, including the carpet.
I don't have any other pics. I don't think anyone has actually drove with them on the car yet. All that have shipped so far have been on rolling chassis or shipped to a shop where the car is being built.