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      04-22-2009, 11:36 AM   #10
SV Concepts
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Drives: Vorsteiner E60 M5
Join Date: Mar 2006
Location: 1460 White Oaks Rd. Suite F. Campbell, CA 95008

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I'd say somewhere between 20-30% increase in stiffness, but I haven't spent too much wheel time on the E90 M3's and I've spent even less time behind the wheel of one with H&R springs, so I'm judging off the typical increase in stiffness in other cars I've driven.

Hopefully someone else can comment?
JL