We have the TEIN Flex installed in EVO8 here at the shop (in your neighborhood too!).. the leveled handling around corners is awesome. If you're planning to use your car for autocross.. I'd highly recommend it. However, if you use the car for daily driving (especially around the city) but want the coilover capability.. I would say go with TEIN SuperStreet. The SS will have a lightly softer spring rate as compared to FLEX, but 16 way adjustible dampening... just like FLEX.

Ange