Just picked up a PSI pipe yesterday. Haven't tried it yet. It looks kind of similar to my dynoport, not quite as fat and has a slightly different curve to it. It's quite a bit different than the lrd systems I have. Much lighter weight than the lrd. It's also quite a bit different then my FMF, much smoother curve and taper than the FMF. I would like to get my hands on a Paul turner high rev, had the chance and should have taken it but I passed it up. I plan on sending the psi to Carl Bartlett so he can run it on dyno side by side with dynoport and ftz pipes. I chat with him here and there and he mentioned guys he know have put them on and never switched to anything else. I will run a seat of the pants dyno with the LRD, dynoport and psi out on the ice in a couple weeks wen its safe. The psi was for sure a good score at 25$