What a raspy sound even is is subject to personal opinion. There isn't an audible world of difference between an x and h so long as they're both catted or o/r. Hence, an o/r h will be raspier than a catted x. I personally had LM1s with an o/r h and it was literally a million times raspier than BKAT's catted x. A Prochamber is the one midpipe that consistently has slightly deeper tone due to it's crossover box. It's really six in one and half dozen in the other though. Doesn't matter, Machs sound good with almost anything.