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It increases pressure to the rear, compared to the stock spring.
Say what? Are you asking if you can run the C5 rear rotor on an early C4? If so, then no. Not w/o a lot of custom machine work and "engineering". Anyway, the C5 rotor is not meaningfully larger in diameter than the stock one...only (meaningfully) thicker.
Thanks , in other words , i have a set of C5 rear caliper, in my 85 ther's a way to use this set even with stock rotor since it came with front kit for free...
I don't think so. I don't think the C5 caliper will work w/o extensive machine work. Anyway, the C5 REAR caliper will show you no meaningful improvement.
383, I don't think the spring will accomplish the degree of change that you're looking for...but it IS a cheap and easy swap to try it.