i don't believe anyone has reported as far as the new topspeed catback, so can't really say anything as far as that goes.
I've had both the topspeed y-pipe model and the cnt exhaust. with motordyne art pipes, the topspeed sounded good but was VERY loud. rasped also in the upper 2k range.
the cnt catback is very mellow, very deep, and zero rasp. exactly what i wanted.
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