If anyone happens to have a good set workable exhaust manifolds, let me know. Meanwhile I might try to weld these cracks. Muggy weld sells products for cast iron and stainless which I will try. Now I just have to figure out what metal I'm working with.

There are multiple cracks in the front and rear exhaust manifolds on my '92 SSE supercharged also. Mine has the digital EGR valve.

I considered having it welded at a muffler shop but instead I bought some muffler pipe weld goop from AutoZone. I don't remember the brand, but it'* a gritty gray compound in a small clear plastic jar, and it cures when it heats up. It'* not one of those 2-part epoxies or one of the gray goops commonly used for tailpipe repair. I think it cost around $7. I applied it several months ago and it seems to be intact still.

That would be real convenient, but I'd like to get a more long term fix. Possible effects on the O2 sensor and problems with welding it later makes me hesitate to try it.

The dealer parts counter told me that the folowing exhaust manifolds should interchange:

91-92 Olds, Buick E-bodies(Riviera,Toronado)
91-92 Olds,Buick C-bodies (Park Ave, 9
92 Pontiac H-bodies

I called up an Olds dealer for a price on the 92 Toronado manifolds and they were they exact price quoted by Pontiac for the 92 SSE. So I'm off to the junkyard and maybe a trip to the powder coating shop.