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That's a new one. There are quite a few threads on lowering a c4 and I would think you could look at how its done and do the opposite. On the back you will just need to get shorter bolts for the rear spring. Up front is likely to be the bigger challenge. I am sure you get get and inch or two all the way around. Why do you want to raise it? Good luck.
Not a C4, but you can see what a raised Vette looks like.............
Actually, that's not a bad idea for C3s--I've always hated those things. A bunch of them on a round platform that spins would be a great use for them. You could sell rides to kids!!
What I'm thinking of doing is to get "my" C4 (it may be closer than you think) up off the ground for the extra ground clearance with speedbumps, bad curbs, and snow; to make it easier to get into and out of; so I can "jog" the frame downward from the A pillar to about the middle of the seat to reduce the step-in height and to get it up a bit for better visibility down the road. I realize the higher CG means it won't corner as well but, from my limited experience with the C4, it will corner way better than my kidneys could take so I'm willing to trade some cornering for the above benefits. I've been thinking about how to do it and the biggest problem appears to be the trailing arm attachment bracket to the frame. Until I get one, I can't do the measurements to see what it will take. The more I study the C4 the more I'm convinced they made it too much of a race car.
I put up the post to see if anyone ever did it but didn't really expect to find anyone. I may get used to the C4 after I start driving one every day and never do it but I don't know that yet. Cheers