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Mazsport sells them, as well as RX-7 store and RacingBeat. I am sure there are more, but those are the ones I can think of off the top of my head.
TurboXS does make one, but without modifications it will not meet up with any other exhaust besides the turboXS one, so I don't think they sell them seperately. This is because the TurboXS is a full 3 inch all the way through, and most exhausts taper down near the flanges to bolt up to the stock components.
a lot of cool dudes will answer your questions accordingly 
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