Trying to source 2 of these, these are the one that attach to the exhaust outlet at the transom, are right angle rubber type 5 3/4" id inlet. seems nla anywhere
I have an unused set made by Delta Flow. You trim the bottoms right at the intersection of the transom and bottom to produce a scavenging effect. I was going to mount them on my boat but installed in-line mufflers instead. Send me a PM.