I'm already running an X-pipe and there really isn't any room in the front for a resonator. That was the first thing I mentioned to the muffler guy when I brought the car in.The exhaust is too close to the body and transmission. Heck, I'm even rubbing in a couple of spots. Anyway, the diameter of the smallest resonators that I could find was 4" as shown in my links above.
What is keeping you from fixing the rubbing? Touching exhaust can make an enormous amount of noise.
