Hi FalconXR- , best pipe I have found so far for the 5 Port turbo is the Dynamite 086 which is available from A-Main in the US if you can't find one locally. This is a top end pipe which brings out the mid / top end on the 5 port which is traditionally a little flat at the top (as compared to the 7 port).
It comes with a medium length U bend header which also makes use of the 5 ports wicked bottom end power and gives you plenty of punch down low. The 086 gives pretty smooth power right through the range. I am also experimenting at present with the LRP 2063 pipe from Massive Mods (in Aus) http://www.massivemods.com.au/index.php?cPath=1. This pipe is also very good, with huge bottom end on the 5 port and pretty smooth right through the rev range too. I am thinking it may be as good if not better than the 086 for my track and local conditions, only time will tell. A lot of guys over here are running the new Go 2047 pipe, but mainly on the 7 Ports and 3 Port R Spec motors. I tried one on my 5 port but wasn't overly impressed to be honest. As of this moment I would have to say that the 086 is king for the 5 port, IMO of course