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I think that a primairy pipe size of max 26 mm internal should be used. This size is used on some Honda 500 -4 engines. Sufficient to support 15 HP per cylinder. The length of the primairy is longer for two into 1 muffler than when each pipe has his own muffler. This comes because the temperature is higher in the first case leading to a higher velocity for the pulses.
Last edited by janvos39; 10-22-2009 at 02:00 PM..
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