Dennis Corso 10-1/2" "Y".
Great pics. thanks. It looks like your header exhaust slots are about 3/8" deep. That's good, my Corso's were 9/16" and too deep, imo. Looks like you have what we now call n.o.s.a
(new old stock aftermarket). You should consider cutting two more slots in each header. Reason? So the hub will compress. Why? That there's (4) slots in the muffler, says something.
I have to scroll a look at your "Y" pipe again. Doesn't look like there's as much kick
in the end piece. Wait a minute...
..there isn't any kick in the "Y" piece
The "Y" has a real hub. And there's no "faux" rivets, so it's definitely not a Dennis Corso piece.
You can "move" that hole in t flat-pipe bracket fairly easily. I did, with an 1/8" spiral burr on a Foredom cable grinder. Took about 10 minutes.
If you want 4-piece rigid Pan exhaust, most definitely get them through your dealer, from Dixie®
. IMO, those are the last of the Mohican's. Those pipe are coated with shop patina. You opened a tomb. If those pipes were still manufactured, I would presume V-Twin would be carrying them.
I don't think Dennis Corso will change the shape of their 10-1/2" "Y" pipe, like ever
. Wonder why he put the kick in it in the first place ? Wonder if V-Twin's including the '58-64 "Y" with their (29-0173)
"rigid frame exhaust" kit was a "warehouse survival measure". The warehouse knew the Corso 10-1/2" had too much kick (from returns experience), so they tried a simple go-around by substituting the '58-64 "Y" instead. The (accommodating) V-Twins returns lady
made the "try cutting off the end of the pipe to fit" suggestion
resolutely, after she talked to the warehouse. Glad yours fits. So does mine (after a fashion).
Chris Haynes was right. Glad you learned something from my mistakes.
I like to have the 1/32 to 1/16"
free-play between the top of the head spigot and the top of each header. You don't want the headers to be force-bound at all.
I don't think anyone will come forward with a positive Corso 10-1/2" "Y" fit, as far as muffler alignment.