I have Super 40 Flows and a ProChamber. The tone outside is just amazing, btw it doesn't sound "off road" at all, no raw tones or rasp just really throaty and mean. It's VERY quiet though and inside it doesn't sound nearly as good, all I hear from inside is a deep "HUMM", doesn't sound aggressive at all. I think i'd get an H pipe even though ive never heard one in person. No problems at all with drone though if thats a concern.