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Got around 1.5" of water at 50 and 3" at 80. I didn't get a chance to take it up higher yet. Measurement was at the front of the airbox right behind the gasket that seals it off.
MAP readings are 1" of hg higher in 2nd gear, 3rd and 4th just go up from there, so considering I got it for free it was well worth it. I thought the SOTP gain was in my head, but I was wrong.