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I've heard rumors about some mufflers offering more power that a straight thru system. But I always figured it was "rumor", OR a very special and rare situation involving header length, size, rpm factors, etc.
The principle of "some back pressure" making more horse power applies to 2 cycle motorcycle engines. It also applies to the length of the "collector" after the headers (assuming the headers themselves are a "tuned" set). I've never actually seen a definitive test where it applies to "mufflers" on any car engine (street or race) making more horse power than open headers.
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