Where should the catalytic converter be located?

• A. Upstream of the exhaust manifold
• B. After the exhaust pipe
• C. Downstream of the exhaust manifold, before the exhaust pipe
• D. Inside the fuel tank

Answer: (C)

The catalytic converter belongs in the exhaust stream just after the exhaust manifold and before the rest of the exhaust pipe. This location keeps the converter close enough to the engine to heat up quickly to its operating temperature, so the catalyst can efficiently convert pollutants as exhaust gases pass through. Placing it upstream of the manifold wouldn’t make sense since there’s nothing yet to treat, and putting it after the exhaust pipe would let the exhaust cool too much and reduce effectiveness. It’s also clearly not placed inside a fuel tank, which is for fuel storage, not exhaust treatment.