bigger rear disc in rear than front a problem I assume?

I'll have to ask hemi denny, not sure on which kit, just started browsing and kind of surprised at the choices but seems like the only ones with four piston calipers are strange (non vented solid rotors) and wilwood, neither cheap. Seems like some of the wilwood also change track width

Just don't want to play musical wheels or brakes, too costly and I really want to keep the exterior pretty stockish looking