I think someone barely squeezed some 16" rims on with a high offset and grinding the corners of the caliper down if I remember right (not something I would want to do.) 17" rims are the smallest you'll be able to comfortably fit on a Sport Edition 4th Gen (don't feel bad, think of it this way, you got a big brake kit!

)4
Maybe 16.5" rims... but I'm not a fan of those half sizes myself.