Also Just tried 275/45/18... Got quite a few options in that size and would definitely give you a taller sidewall. I'd estimate 1/2" -3/4" bigger sidewall? You might run into rubbing issues with that though.
I wouldn't go with the Pirelli p zero Roso. I have them in 285 on the back and can break loose in first and sometimes second with my little v6. I would imagine you would have no traction with 4.30 gears and much more power.
Hit up boss I know he has some big ol' nittos on his, I think he has a 45 series tire
Saleen SuperCharged, C500 Side Exhaust, Cervinis Ram Air IV Hood, Hurst Short Throw Shifter, Chrome GT500 Replica wheels, GT500 Front Splitter ModBMR 1.25 Lowering Springs, ADJ Panhard Bar, CHE Torque Limiters and K Member Brace
Why do you have 4.30 gears? Thats a little steep IMO
I would just save up and change them to 3.73s or 4.10s. Getting a bigger tire wont do much unless you put a 35in mud terrain on it or something lol. Stepping up to the biggest size without rubbing wont make a noticeable difference at all since you wont be able to go THAT much bigger without rubbing