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If you have dual 2.25s or 2.5s, either way you're likely going to be using a crossover pipe, so there really won't be much difference in sound compared to a big single system. If a 3" single is enough to support a 350 cube, 5500 rpm motor, then I think it'd be more than adequate for a 3.7 liter 7000rpm motor. Also, while the chart above is a nice rule of thumb for squeezing every last possible peak horsepower out of a motor, keep in mind it's very likely the motor's midrange will suffer for it a bit.
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"To know a thing well, know it's limits. Only when pushed beyond its tolerances will true nature be seen." Amtal Rule
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