4-stroke pipes - disc vs. megaphone?
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Most of the time on 4-strokes a "disc" type set-up is good for small hp gains across the board along with better low end torque than stock. The "megaphone" set-up is more performance oriented...especially peak power. In simple terms, the principle of the megaphone is air travels from a small area (the headpipe), to a larger area (the silencer with an open end), thus creating a "suction". Usually...the trade-off is a slight loss of low end torque and hp for a large gain in the upper RPM ranges.
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