Thank you for posting these graphs Jerry. What year top end? and to be clear that was a #09 HPR pipe.

The cylinder was a 1987 large reed cylinder. 

The pipe was HPR #9 not HPR #19

The guy brought the quad in to have a big carb put on it and dyno tuned.   There were two other quads in the shop for top end jobs and their pipes were off.  One had a HPR 9 pipe that we had build a few years prior and the other quad had a Q 1.0 pipe.  The owner of the Trinity piped quad saw the two large diameter pipes off of the other 2 quads and he wanted to know how the power of the Trinity compared to the "fat pipes".  I told him I had not tested a Trinity but the pipe looked like a Power Pros pipe I had tested a year or so prior.  We tuned his bike with the Trinity pipe and then we called him so that he could watch the pipe test.   He was not very happy after the pipe test because he had recently purchased the pipe after seeing it in one of their big shiny adds in a magazine.