Hey man. The flows sound great at low-mid rpm. Of course, when you get up higher in the power band, it gets a tad raspy, however, the headers help diminish it. I understand where you're coming from, that's the last thing I wanted from an exhaust. Hopefully I'll be posting a little walk around video on Friday (this week is finals week) so you'll be able to hear it then. Of course, the computer speakers don't do it justice. Headphones help a little haha.
To clarify: I don't have an X or H. It's just two pipes coming right off the headers haha. Don't know how much of a sound difference that'll be from an x pipe