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I've been using the same digital manometer for my testing. Rather than dampers on the hoses, I use the recording function on the device: one press turns on recording, and three more presses of the same button displays the average pressure recorded over the interval. After the car is up to test speed and I start recording, it typically displays a stable number--but since all the roads here are on a one-mile grid I usually have 40-45 seconds of recording time just in case it was on the verge of ticking up or down, which happens occasionally.
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