no silencer does not come w/ it. $25ish extra from corksport. I had the exhasut on my car for about 10K miles w/ no motor mounts and have had no problems w/ the resonator cracking, just installed front and rear MM about 2K miles ago so looks like i lucked out. It all depends on how worn your stock mounts are. My friend got the corksport and cracked his resonator in no time and we noticed before we put it in that his motor moved around a lot.
As far as the noise, on the freeway it gets real loud at about 80 mph but you can cruise at 70 comfortably. It's a relatively quiet ride from about 3,000rpm - 5,000rpm. but i'm with officer farva, i love it.