What tells you your subframe is misaligned? Is it visual or something about the drive? On older s chassis cars I've had the bushes have worn to the point there has been knocking and clonking, and sometimes you can see fluid has escaped but the s15 bushes appear not to be fluid filled, just rubber with holes. That said, I recently put Whiteline bushes in to replace my completely fine standard bushes and its made a really nice improvement to the handling. Very predictable and sharp. Horrible job though and you need a press to get the bushes in.