A 9" wide wheel will be very tough to get to fit in the front on our cars. That offset is probably about as good as you can get. Technically the inside of your wheel should be 2mm closer to the strut than mine so I think it will fit that side. I'm on KW's which supposedly are exactly the same as ST's except the metal used. You'll be poked on the outside 10mm further than me already so hopefully you won't need a spacer.
Hopefully you mean to run 225/40/18 fronts. I assume you are planning to semi-slam your car. If that's the case I'd run 225/35 fronts. I rubbed at times in the front with my previous tires, but I think it was the height and how lowered I was more than the width.
I think it's the design of our cars that makes us all rub on the passenger side rear. I can definitely see that my passenger wheel pokes out more. Your rears will poke out 11mm further than mine. I run 2deg front and rear camber and my fenders are rolled, semi-pulled. You are gonna have to do more than that.
Good luck, but I think more aggressive sets have been ran already so you should be able to make it work with some effort. Keep us updated!
Injen, RR OCC, MadDad Whisper, donut spare, 19x8.5et43fr 19x9.5et45r Volk LE37's, rear fenders rolled/pulled, Nitto 555 225/35fr PSS 255/30r, KW V1's, AR coated catless dps, Cross strutbar, CF grills and license plate holder, rearseat removal, iCarbon diffuser and front lip, ETS black anodized FMIC, M3 control arms, Quaife, ER chargepipe, ForgeDV's, Topspeed Custom Tune, V3sims, Braille, Andrey_GTA rear hub mod.