Its not bad really. There is a point in the revs somewhere that harmonics are a little intrusive, but it sounds awesome from the outside. I have a clip of a fly by I did, but would prefer to rip the sound from the video if I could. If anyone can suggest a programme to do it, I will post the clip.
As far as I know, the resonated system is probably not much louder than the stock exhaust. I am glad I got non-resonated.