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The Tech. support guy I worked with at Flowmater explained it too me as the pulse is split it bounces of the top and bottom of the skin then comes back together in a (not sure if spelling is right)Wolm chamber where it scavenges and pulls the pulse out, up too a certain RPM but does become restrictive at high rpm's but if you have ever heard 112db is unnerving. this exhaust will pass at Laguna @ 72 deg with only a 10 hp loss,plus tips, Have you ever seen some of the systems they bring out too Laguna. I'll find some and post.
Ferd
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