RE: Pipe selection for Hyper 21 8 port.
Someone double check me on this, but I think the OFNA 086 would probably work well...I had a 053 on my 8-port Race and they did NOT play well together, and the Hyper crapped out (hated it anyway, I wish you the best of luck with yours tho) before I could try anything else. Check the ofna message boards for the Hyper carb tuning sticky thread as well...they are notoriously finicky.
-rocky b