Tein Basic - height adjustable by spring seat
Tein SS - height adjustable by spring seat and dampening adjust-ability
Tein SSP - height adjustable by spring seat and dampening adjust-ability, you do not need to reuse your oem tophats
(7/4 Spring Rates, comfortable for daily driving and can still be fun, not meant to slam your car, can bring the car height close to oem height if need be for winters/etc)
FF1 - height adjustable by lower mount
FF2 - height adjustable by lower mount and dampening adjust-ability
FF2.5 - height adjustable by lower mount and dampening adjust-ability
Megan EZ Street, KSport, NEX, D2, JIC Magic - height adjustable by lower mount and dampening adjust-ability
(much stiffer spring rates than Tein, might not be as comfortable depending on your taste, you can slam the car but the highest you can bring your car too is still about a 2.5" drop)