On the rear you can go with a 305, 315 or maybe even bigger. What you have to watch is the overall diameter of the tire. Our stock Coopers @ 275/40/18 have an O.D. of 26.64". Compare that to 285/35/18 = O.D. 25.91", 295/35/18 = O.D. 26.20", 305/35/18 = O.D. 26.42" and 305/45/18 = O.D. 28.80 just to name a few. Spend a little time on @
Tire Rack - Your performance experts for tires and wheels and you can find the info you need.
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Grabber Orange 427R #07-486
Roush Short Throw Shifter
FRPP 3.73 Gears
Roush 73mm Pulley and Tune
Planned Mods: MAC Pro-Chamber, Drag Radials to name a few.