Try the following... a bit more info, though you can't really get a good, definite answer.
http://waw.wardsauto.com/ar/auto_chi...oup_suspension
http://www.f150online.com/forums/arc...c/12977-1.html
I'm assuming they aren't REALLY close to the stiffness of the OEM VX shock, but they don't sound too bad. I may be wrong, but I just don't know. If you are interested in this type of valving, you may also want to check out:
Edelbrock IAS shocks:
http://www.edelbrock.com/automotive/...ubeshocks.html
Rancho RSX:
http://www.gorancho.com/products/shocks_2.stm
Here's an interesting read (from a couple years ago, and pertaining to Dodge Ram trucks... but they are trucks!):
http://mailman.xmission.com/pipermai...18/017168.html