well, the one in Ormand Beach, Fl has a bit of experience, the dude did a really good job and I now have the resonator in there. I thinks it's packed with fiberglass or something, but anyway, it's going to take about 800 miles to break in so hopefully it'll quiet down a lil more in the accel. There is absolutely no noise, witht he exception of the TOD, at speed above 55 unless I give it gas, in which the truck lights up. I installed the resonator right after the muffler.. no where else to place it.