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The Racing Beat cat-back exhaust is beautifully constructed and, more importantly, yields a significant boost in power without an obnoxiously loud engine note (a serious worry with a rotary).
Mazda RX-7: Part 4

 The Racing Beat cat-back exhaust is beautifully constructed and, more importantly, yields a significant boost in power without an obnoxiously loud engine note (a serious worry with a rotary).  View Related Article

 

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