I just had a MBRP 4" TB exhaust (with muffler, no cat)put on my truck while it was in for studs. It has a good deep tone to it during acceleration. It sounds good, except for the in cab drone around 2000 RPM. Wonder if a resonator would help get rid of that? Will it hurt the performance of the exhaust system at all? I like the "big block" sound of the exhaust, I just cant deal with the drone at highway speed, or even when it idles a little high when its cold.