Bummer you should ask the pipe manufacture to provide a map. If they did their homework during the development of the exhaust system then they should have a fuel map.
Problem is most pipe makers just bend tubes and make noise. Very few do development work.
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Short silencers are all designed for looks over function. The longer the silencer the greater effect it can have over the pulses This being said there are many ways to configure the silencer to mimic distance. As for sound absorbing properties volume around the silencer effects this as well...