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Bit more to a diff than backlash to be honest. If it is running excessively on the heel or toe it will also cause a noisy diff. Only way to test it properly is to put some bearing blue on it and see where the teeth are meshing. If it is a backlash problem, it will need to go to a mechanical...

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Its very easy to test. Put a boost fitting in the rubber inner duct and measure the pressure or vacuum there.

You are right Tony, but its the bends that offer the most restriction. Not so much the length of the pipe. So, after a long winded argument the fact still remains. Snorkels are there to stop water ingestion. And may actually reduce engine performance through restriction OR balance it out with...

Im not sure what your test is trying to prove?