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The advantage of a dual exhaust system is that the engine exhausts
more freely, thereby lowering the back pressure which is inherent in
an exhaust system. With a dual exhaust system, a sizable increase in
engine horsepower can be obtained because the "breathing" capacity of
the engine is improved, leaving less exhaust gases in the engine at
the end of each exhaust stroke. This, in turn, leaves more room for
an extra intake of the air-fuel mixture.
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