How many catalytic converters does a 5.7 Hemi have?
The typical 5.7-liter Hemi V8 uses four catalytic converters in its exhaust system—two on each bank of the engine.
Across most U.S.-market models, the 5.7 Hemi’s exhaust is arranged with two catalytic converters per bank, usually in sequence from the manifold toward the tailpipe. Exact configurations can vary by year and emissions requirements, but four converters is the common setup for the mainstream version of this engine.
Typical catalyst layout for the 5.7 Hemi
Before listing the standard arrangement, note that the following describes the common setup found in many 5.7 Hemi applications such as Charger, Challenger, and Ram. The design features two catalytic converters on each bank of the V8 engine.
- Bank 1 (left bank when facing forward): upstream catalytic converter (pre-cat) near the exhaust manifold, followed by downstream catalytic converter (main cat).
- Bank 2 (right bank when facing forward): upstream catalytic converter (pre-cat) near the exhaust manifold, followed by downstream catalytic converter (main cat).
In practice, this means the engine typically has four catalytic converters in total—two per bank—working in tandem to reduce emissions before exhaust gases exit the vehicle.
Notes on variations
While four converters is the standard for most mainstream 5.7 Hemi installations, specific models, years, or regional emission rules can introduce small variations in placement or designation (such as differences in pre-cat versus main-cat labeling). Always consult the vehicle’s service manual or parts diagram for the exact configuration on your particular model and year.
Summary
For the common 5.7 Hemi used in Dodge’s performance sedans and Ram trucks, expect four catalytic converters in total—two per exhaust bank (pre-cat and main cat on each side). This setup balances emission control with exhaust flow across typical U.S.-market configurations.
