Was talking to a mate of mine who is clued up about Corolla's and MR2's, he was telling me there's a way of using a 275mm disc with Levin twins. Whether that would be better than the single ST185 I don't know, as the ST165/early ST185 had twins, and late ST185 singles. I would presume the latter is better, but that may also be due to the increase in disc diameter