I tried the OS 2050 on my Go 5 port and must say this is the pipe I`m sticking with.......I am averaging easy 10 minute run times per tank...I was running a OS 2060.With the 2060 my run times where around 8-9 minutes.I very,very little top end and gained more bottom....The track I run on is very large and is a on throttle track.....Oh and my 5 port is not modded and was running rich.....I believe I could still lean it out some more(many clouds of smoke)