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its the muffler is where u see most of your gains. A full mandrel bent exhaust system like Thermal, Magnaflow, Apexi, etc u will only see 3-7 HP. All of these gains will be over 4000 RPM! As far as exhaust flow, anything over 2.25 inch for most hondas (naturally aspirated of course) u will see a power loss. 2.25" seems to be the ideal size.
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