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Re: exhaust backpressure - how high is too high
Posted to Technical Discussion Forum on 9/28/2010

Philip:

Based on many vehicles I have tested, I would say that your test results are too high. I typically see less than 0.5 psi at idle and about 1 to 1 1/2 psi at 2,500 RPM. The most I have seen is 5-7 psi at idle with 15 psi (pegged the needle) at 940 RPM... Login to read more.