Valet
IS300 SX > Accord
If you want to be a pr**k about it, I can always go make another thread just as pointless as this thread asking a simple question. Or you can just shut up.

Chill out champ. I wasn't being serious, and to answer your extremely lame brain question that yields from a lack of searching, you don't need anything else when installing coilovers. Nothing needs to be changed