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I have this exhaust and originally had a RB DP. It requires a cat, pre silencer, test pipe, something to connect the DP to exhaust. So unless the Mazdatrix is two pieces, or obscenely long, you will need the same.
they don't make it anymore but corksport had a really nice resonated test pipe. if you can find a used one i'd definitely recommend grabbing it. my exhaust sounds great with that and custom piping to an apexi muffler