Front or rear?
Mine is same setup as yours, front was ok, rears needed pulling in with the cusco camber / toe arms from the +4 they were at!
You get any arch rub on the rears in corners?
No but its very close, I can't get a finger in between my wheel and the arch. Definitely doesnt rub though. I had my alloys powder coated (GTS's same as yours) and new Falkens on the rear and I had to keep tightening them every day as the extra thickness of the powdercoat between the alloy and the hub needed squishing as it was making it rub. Bit scary when you are going round a corner and one of the rears decides to brake on its own