The distance from the top of tire to lip of wheelwell is essentially the same as the R/T. I would still recommend the 20's because they fill out the bulging wheelwells and give a better stance. They do not stick out past the wheelwell edges, but they are not tucked in underneath either. As far as the noise, I am too particular I suppose. The noise isn't that offensive overall, but I drove my truck for a week and a half before the 20's and there was quite a difference in my opinion. But I always have the radio on and its no big deal. Just wanted to make those interested aware of really my only gripe.