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Life: Comedy or Tragedy?
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I believe it's to help reduce the back pressure as well as provide for a post combustion expansion chamber. It probably helps to smooth out the exhaust gasses so they aren't so abrupt and provides for a smoother exhaust flow.

I'm kicking around the idea of going with full exhaust on my YZ450F, but I have a difficult time justifying it, especially when the '07 stock exhaust is pretty good. Maybe if I get into racing, I'd consider it further.
 
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