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Message: <blockquote data-quote="supergripen" data-source="post: 313325" data-attributes="member: 1254">well,theoretically,performance exhausts flows better by having larger diameter pipes and less restrictive silencers.on the exhaust stroke,engine horsepower is required to force exhaust gasses thru a system.by reducing resistance to this gas expulsion process,less bhp is needed thus making more available at the flywheel instead..hence,more power.the amount of gas an exhaust system can flow is proportional to the velocity of air multiplied by the average path area thus a bigger pipe should see gains in bhp.note tho this is only true up to a certain extent..if the pipes are too big,the velocity of air/gas starts to decrease thus reducing low end response/torque.so choosing the diameter of the piping in an exhaust system is not a simple matter.note also that NA engines are more prone to the effects of losing low end torque compared to turbo engines.other than the header that needs to be bent for obvious reasons,another thing that affects flow will be the path of the pipe/pipes.a straight one should in theory be better that one that is bent,also the internal surface of the piping shold be as smooth as possible to avoid hindrance/turbulence.so here,i don't see why a split pipe quad exit setup should be disadvantageous as long as the proper path of the pipings is established.the only disadvantage i can see here is probably the increase in weight la..my 2 cents</blockquote>