* 3.1m V6: The "m" likely indicates a naturally aspirated engine. This means the engine relies solely on atmospheric pressure to draw air into the combustion chambers. There's no forced induction (turbocharger or supercharger).
* 3.1T V6: The "T" signifies a turbocharged engine. This means a turbocharger uses exhaust gases to drive a turbine, which compresses intake air before it enters the combustion chambers. This results in significantly more power output from the same displacement (3.1 liters).
In short, both are 3.1-liter V6 engines, but the turbocharged version (3.1T) will produce considerably more horsepower and torque than the naturally aspirated version (3.1m). The turbocharged engine will also likely have a different powerband and potentially different fuel efficiency characteristics.
