they make it so you dont have to fuck with the strut rod like tim said, also help with camber and ball joint angle, i think they are a good investment, the can do arms are exacty copies of the kustom werks but they are tightened up a bit, thebushings have no play and the machining i think is a bit nicer, if you have questions go ahead and call or email me
info@railitcustoms.com