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It's not about back pressure, it's momentum! the exhaust is exiting in pulses not a constant flow, if it was a steady flow then larger would be better, but your engine is not a turbine... and even with a turbine you have to tune your exhaust to keep the momentum to help the engine run better (at least the books on turbine design seem to say so), so what it boils down to is if you believe in physics a properly sized exhaust is going to treat you best, if you are 16 and were given a car, and failed math class then go with a larger exhaust.
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