Called up and talked to Dave at timevalve. Actually I had seen these before but couldn't remember the name. Nice guy, and they sell a full catalytic-included system ready to go. Actually uses a 2in-2out instead of two single ones. They seem to have done this many times before so sounds good to me. Not sure if quoting prices is okay, but I will say that about $1000 gets me a bolt on stainless system ready to pass emissions (including all hangers, bumpers and gaskets).

Once again, the forum comes through.

1985 euro W126 500SEL