I've got you covered bud, I've got a 2006 300 SRT8 with 275/40/20 on the front and 295/40/20 on the back. I'm not gunna lie, the backs are pretty tight but it has never rubbed. There's about a half inch of gap at the tightest point. I have the factory wheels and zero suspension mods. I wanna try 305's on the back next, but I honestly don't know if they'll fit.
Feel free to PM me if you have any other questions.
