I've just bought an '89 GTE 16V. Should this have a cat? It looks like theres one on the car, just after the manifold, but I can't see a lambda sensor anywhere and the fuel tank filler doesn't look small enough to be unleaded only.
The exhaust is very noisey as well but looks standard (2 boxes plus what looks like a cat) and the back box has a GM stamp. Any explanations, other than rotten silencer innards?