Quote Originally Posted by aaronng View Post
Both Flex and SS have 16 levels of adjustment. You cannot adjust spring rates. If you want to alter the spring rate, you need to change the springs.

The difference is that Flex comes with an adjustable lower mount, teflon coated threads, higher spring rates and the upper pillowball mount.
Tein SSs have the upper pillowball mount aswel, well atleast mine did and i got them on tuesday