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I was wondering what appropiate exhaust back pressure should be. I have a 1998 Honda Civic LX and my back pressure readings at idle and 4000 rpm with no load are less than 0.5 psi. Under load with the throttle at about 30 – 40 percent, and at 2000-3000 rpm, I am reading 2.5-3.0 psi. 0 percent throttle shows less than 0.5 psi. Is this considered normal?
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