From what I have read on these forums the Dynamite 086 goes really well on the .25 6 Port. I am guessing the 0801 would work the same or a little better, with more pull down low than the 086.

The Dynamite pipes are great value for money. The 007 is their low end pipe for max torque but not to flash on the top end. The 053 is their mid range pipe with ok bottom end, great mid through to a reasonable top end. The 086 is their high end pipe with ok bottom, reasonable mid and great top end.
The Go 0801 combines better bottom end (due to a longer header) with strong mid and top end, so it pretty much pulls hard from start to finish (on the 7 port it does anyway). The Go 2047 is a good pipe too. Strong bottom and mid, but flags a little on the top end.
Sort of depends what motor and track your running and how you like to drive.
Everyone has their favourites. I find the 0801 on my 7 port is a really good combination for me.