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First of all, mandrel bending is completely independent of the material being bent. That being said, some materials are more resistant to bending than others.
During mandrel bending, a 'mandrel' is stuck into where the bend is going to be created. It allows the outside of the tube to stretch and the inside of the tube to compress, while keeping the material from crumpling together and 'wrinkling', you could say. Think of a normal straw, and a straw with that bendable neck. Visualize bending both in your mind. Which one of them flows a fluid more easily?
If you didn't infer from that previous paragraph, mandrel bending allows fluids to flow quicker and with less turbulence than with standard crush bending. When this is applied to an exhaust pipe, backpressure is reduced and you'll see some power gain.
EDIT: Damn my grammar is bad tonight...
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Some things are impossible, people say. Yet after these things happen, the very same people say that it was inevitable.
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