One of Mazda's more popular diesel engines, it was also available with a pressure wave supercharger called Comprex.

Pressure wave supercharger.

Pressure wave superchargers, also known as wave rotors, such as the Comprex and Hyprex units, use a synchronised supercharger to utilise the exhaust pulse energy.

However, parts that would be more expensive are supercharging (be it pressure wave supercharger or turbo-supercharger) and the wheels and the wheel suspension, which are made of aluminium.

The Greenpeace SmILE concept car uses a Hyprex pressure wave supercharger developed by the Swiss company Wenko AG.

Some models were available with a new 2.0 diesel RFT engine, notable for its use of a pressure wave supercharger (Comprex), that previously could be found in the Mazda Bongo commercial.

A pressure wave supercharger (also known as a wave rotor) is a type of supercharger technology that harnesses the pressure waves produced by an internal combustion engine exhaust gas pulses to compress the intake air.