I'm looking to find out what the differences are between the Gen3 and Gen4 exhaust systems are, to see if the SHObros 96-99 Vulcan y-pipe will fit a Gen4 Vulcan.
Mainly, I need to know what the difference is between the G3 and G4 exhaust manifolds is. Rockauto shows different part numbers for Dorman "OE Solutions" replacement manifolds, which are:
2001 Left: 674363, and 2001 Right: 674566
1998 Left: 674365, and 1998 Right: 674362
The pictures on Rockauto comparing the left manifolds look very similar, but it's hard to tell because they're different angles...I'm not sure if Rockauto uses images of the actual parts for everything of if it's just an example.
The connection to the exhaust manifolds is my main concern. I'm also looking for a picture of the underside of a G3 Vulcan showing the connection between the y-pipe and the rest of the exhaust system...search didn't turn up anything. I think there's a picture that might show this in the Haynes manual, but I don't have access to one right now and won't have mine for a couple weeks, and I don't have access to a Gen3 to compare in person.
The plan I'm thinking of is, if the SHObros y-pipe will fit with Gen4 manifolds, I'll remove my 2001's third cat, and I'l come up with something fabricated to connect the y-pipe to the rest of G4 exhaust that incorporates a flex pipe since the G4 flex joint will no longer be there.
If the manifolds don't match up, I could always pick up some Gen3 manifolds from the junkyard, but I don't want to if they either won't fit or aren't necessary. So if anybody has any knowledge of both G3 and G4 exhaust systems, your wisdom would be greatly appreciated so I can decide if making the SHObros part fit is worth it. Thanks