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Theoretically no, you don't need new shocks, however what you'll effectively do with 60mm drop is have the shocks under constant compression, which they don't like. Usually the seals will give way prematurely and you'll spring (pardon the pun) leaks.
Ideally you should get some new shocks (I can recommend Koni) that way when you sell the car you can put it back to standard, and flog your uprated gear.