Heard so much about em, but don't really know of anyone with em down under, so I've never heard em in the flesh. Do they really sound like Thunder? do they have that annoying drone? I'm considering putting them on my freshly-tickled 440, with a full 3"system. I'm all for loud, obnoxious, in-your-face, over-the-top exhaust sound, and have heard that these are the way to go. any videos much appreciated!