The issue is not the size of the wheel wells, but the spring location. E body springs are splayed wider at the back, so without a spring relocation, you will hit these before you run into the wheel well.

With a 1.5-2" spring relocation, you can fit a 335 width tire in the stock Challenger well.


I have fit a 295/50 on a 15x8 wit 5.25 backspace in my Challenger with no mods at all.

My Current set up is a 305/45 on a 15x10 with 5" back space and a 2" spring relocation and a B body housing. The 2" relocation makes the B body housing a drop in with no perch relocation. If you retain the stock E body housing you will need to move the perches to mate with the spring relocation and you could get away with a 6" back space.