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i've never heard mac, so i can't comment on those. flows give you a nice mild rumble at low RPMs. they drone out pretty bad when you get in the upper revs, but you'll mostly just be cruising low so who cares?
I havn't really heard Flows in person yet but I love my Macs... and they arn't even made for my year... LOL. Custom Fab FTW! I'll try to have vid up later today... I've been meaning to take one but haven't gotten around to it.