^^ Exactly.The exhaust goes out the front of the engine there, as there's no exhaust manifold in this engine. I believe that silver piece of metal is basically just a heat shield. Pre-catalyst O2 sensor is what you described as a spark plug, and then the first catalyst is the vertical wider cylinder just below that metal shroud.
There's still a second cat down underneath the car, no?First time I looked at the newer Honda 4 cylinder engines I did a double take. I am interested in how much longer the catalytic converter will last now that it is in the engine bay, rather than underneath the car where Chicago's winter road salt could attack it and destroy it- costing hundreds of thousands of dollars and millions of lives.