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Ah, now... we talked about this at the Christmas lunch. Lord Foghorn of Nantwich reckons his is louder with the H-pipe (the phrase "demented blacksmith" has lodged in my mind) but Jeff of FD fame reckons the H-pipe is without doubt quieter.
H Pipe is not as trumpety as the x pipe. It's deeper compared to the X pipe and gives more of a growl. From what I recall higher up the rev range X pipe gives more torque as opposed to the H pipe giving more torque at low revs.