A New Post has Been made to the thread [exhaust]
User From: roaddancer
The Reply was:
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If the engine did not come from a dual exhaust rx7, you won't shut it up with any full dual setup. Mazda did some funny port things on the dual exhaust models to take the sharp edge off the exhaust pulse. I thought that a "sawtooth" leading port edge might do it also, but I didn't think to patent and call the factory!!
My '74 was way loud! Full dual, crossover resonator, two mufflers, and tuned exhaust tips.
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