my '87 sisley has cat, carb & dizzy.
It was originally built for the Swiss & Swedish market, but sold in Austria.
There's lots of vacuum tubes & valves fitted to Carb, thermostatic valves & other stuff. I guess all that is a predecessor of the electrically operated ecobox. Also there's extra piping connected to the exhaust manifold & Air intake. Some kind of exhaust-gas-recirculation system or afterburner.
I am still looking for a manual that explaines all that extra stuff.
Because some parts were missing and damaged, I had to disable it all.
I guess the cat will be gone anyway, since the engine ran 140K km. without the modern motormanagement tricks to protect the cat against unburnt fuel.
(please excuse my bad english, I'm Dutch....)