I had good luck with a pipe from an older Polaris that matches the engine size when I put one of those into a 76 Panther.
'93 wildcat 700efi w/Comet Pro-4 clutch
'80 pantera 500 FC w/ Comet 108
'90 Wildcat, project in progress
Sec. Dryden Lodge #472 F.&A.M.
Trail Boss: Dryden to Groton area
www.dcdrifters.net
If I get to doing any better I am going to have to hire someone to help me celebrate.