Smart Fortwo 451 exhaust system components: manifold, catalytic converter, main muffler, and oxygen sensors.

Exhaust system assembly with labeled parts: manifold, catalytic converter, muffler, and O2 sensors.

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See all Powertrain figures for the Fortwo (451), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.