Fitting 275 Square tires on my Non-M coupe

This past years I've logged a lot of autox hours and track time. I want to know what it would take for me to run 275 square tires on my non M coupe.



Currently I am running 255/35/18 Pilot Super Sports on my 18x8.5 et40 Enkei RPF1s and I feel that I still have a bit of room to play. Is it possible that I can fit 275s on an 18x9 (Dforce LTW5) or 18x9.5 (Apex ARC-8) with nothing more than a fender roll/cut? If not what would be required?



Thanks!