by 
Sam Eis
ANSWERS: 1
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You don't usually. It's MOSTLY a myth. I think you might want to read this: http://www.uucmotorwerks.com/html_product/sue462/backpressuretorquemyth.htm It begins with the following quote: "Some say that "an engine needs backpressure to work correctly." Is this true? No. It would be more correct to say, "a perfectly stock engine that cannot adjust its fuel delivery needs backpressure to work correctly." This idea is a myth. As with all myths, however, there is a hint of fact with this one. Particularly, some people equate backpressure with torque, and others fear that too little backpressure will lead to valve burning."
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