okay...you've just bought a performance car...and now you want the biggest rims that will spoil the performance of the car!! (just my opinion...but i think most people on here will understand my viewpoint) as i understand it...(correct me if i'm wrong) 15"s = best for performance, 16"s = best compromise of looks/performance/big brake capability's, 17"s = look good but compromise performance and most will fit without arch mods (if they're no more than 7" wide), 18"s = best looks worst performance and need arch mods, any bigger = forget it unless you want to chop the car to bits.