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      04-21-2009, 02:07 AM   #3
FStop7
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Drives: M6
Join Date: Oct 2008
Location: Newbury Park, CA

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Which claims are you interested in? The biggest claim they make is lowering ride height and that's easy to measure. Since none of these companies advertise their spring rates (or if the springs are linear or progressive rate) that can't be verified. There's not a lot else to scientifically test.
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