ExhaustGaskets
From LinerWiki
Exhaust Gaskets
The OEM exhaust gaskets are Yamaha part # 3EG-14613-00-00.
Fel-pro makes an extremely similar gasket, which is part # Fel-Pro 23588. The Fel-Pro gasket should be available at most AutoZone and Advance Auto Parts stores.
NOTE: 1 forum member found that these gaskets were leaking when used with Hard Krome 3" Big Straight exhaust. Going back to OEM gaskets solved his popping problem. Keep this in mind when trying these gaskets.
Reference: http://forums.delphiforums.com/starroadliner/messages?msg=8731.1