We found this usefull link on the net our systems are based on this theory in the past though some people may think this is bull but if the wrong size Exhaust system is fitted you might experience Overheating and weak pulling and a number of things can go wrong. Guys when you do your Lexus or Turbo conversion Make sure your Exhaust guy knows what he is doing!


smiley http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/ wink

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