31K km definitely seems a bit premature. I have had stock shocks go 60K after lowering the car.
I have to agree with Jeffblue. You are better off going full coilover. You are going to spend at least $450 on struts alone. And you can always sell your H&R springs to make up some of the cost. I'm going to go the coilover route whenever my shocks wear out.
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Slightly modded
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