not all tein superstreet can install edfc
u need to buy the one with pillowball mount which cost you 1k more comparing to the one without pillowball mount RM3xxx. i'm using the pillowball mount rm4500. the edfc RM1xxx. eventhough i've tuned it to the stiffest but i'm still enjoying it. now planning to change another set, stiffer one so, no point for me to buy edfc