I can't say I felt it compromised the ride quality at all. It made it a little stiffer but then it would do as my old springs were about 9yrs old and I had all 4 replaced at once. My guess would be that they are not much difference to stock when new.
Hope that helps.
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Present: 2009 Volvo V50 1.6D DRIVe SE
Past: 2004 Volvo S40 T5 SE
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