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The car would be bumpier but handle better. From what I remember the Z51's come with poly mounts, putting rubber in would make them a little softer if they turned out to be to much.
I recently did this to my coupe and really like the results so far, although I've only been back & forth to work since the swap.
It's quite firm but not harsh - any jarring bumps are the ones that were annoying previously. I like the added road feel so "bumpy" isn't a word I would use.
Not sure about track or twisty behavior, although it's got to be better than the (probably) worn out base shocks I took off.
The car would be bumpier but handle better. From what I remember the Z51's come with poly mounts, putting rubber in would make them a little softer if they turned out to be to much.
Mine (purchased earlier this year) came with rubber mounts.
I put the Z51 bilsteins on my FE1 vert and it made a huge difference. I had someone drive my car the other day who works on a lot of C4's and he said it was the best driving (ride wise) C4 he had driven.