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i know almost exactly how itll sound. i went from a highflow catted h(they sound real similar) to a mac o/r h and back again several times (dont ask) like said, itlle sound less refined and crack/pop more but be intensely loud when you get on it. best way i could describe my exhaust with the o/r pipe was just plain sick. honestly though, i think i prefer my mac catted h i just got cause its deep, but loud as hell for a catted h. id stay with the prochamber because thats one of the best midpipes out there, but the o/r h wont dissapoint you.