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I dont think its from a lack of back pressure, there engines do not need back pressure, they're not two strokes. there's a chance the leak could be causing more back pressure though dpending on the size and location of the leak. It could be causing turbulence inside the pipe and slowing exhaust flow.
Of course like usual I am basing this on no facts that I have observed, just a few things I remember from a fluid dynamics class.
You said it is rusted on the down pipe, where? is it the flange, actually on the pipe itself, or the two studs rusted out?
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'11 Kawasaki Ninja 250R, '12 Mazda2
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