Discussion in 'Challenger DIY/Tech Info' started by SRT-Tom, Nov 16, 2018.
Here is a great discussion of exhaust flow and why back pressure is not desirable.
So he's saying you don't want back pressure but then says basically that you need some, by reducing pipe sizes, to get optimum velocities for scavenging.
So I think he's indicating, but not saying, you need just enough to aid the scavenging affect.
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