I think that Skunk2 only makes parts for the K20, and the only ones that fit the ex/lx/dx are suspension. Don't get me wrong I love Skunk2 and I hope they make something amazing for our cars, few automotive contributions to our cars would make me happier.
Edit: Skunk2 does not only work on the K20(duhh). But I am not aware of this company working on the R18