305 is more than enough to go 4.xx second 60-130.
I ve tested various tire sizes and 305 is ENOUGH.
All you need to do is set the COMPLETE VEHICLE AS PERFECT AS POSSIBLE SO THAT IT HOOKS.
I would not spend any money for widening the rear arches.
My sub 4.xx second 60-130 will be made with smaller than 305 tires as well.
E46 M3 Sedan All Wheel Drive Twin Turbo
0-100 km/h 2.91 seconds @ 15 psi
E46 M3 Coupe Turbo 60-130 mph 4,2 seconds (2011)