Tommy, there has been a debate about having to use offset bushings for a while.

Check on zilvia, there is 2 or 3 threads about it. A few members say that they have been using s14 subframes, with s14 bushings in s13s for quite a while. I don't know if any of that holds weight at all, but I would def check with them(its a shot IIRC) and see whats up before you spend unneeded money.

EDIT*
Damnit, Chris beat me again.. Fucker =(