* Audi 5-cylinder 2.2L turbo engine (found in the Audi Quattro and other models)
* Volkswagen 4-cylinder 2.0L turbo engine (found in the VW GTI)
* Volkswagen 4-cylinder 2.0L naturally aspirated engine (found in the VW Jetta and other models)
These engines are all relatively compact and lightweight, making them suitable for the 944. They also offer good power and torque outputs, while still being relatively fuel-efficient. With some minor modifications, such as custom mounts and wiring, these engines can be installed into the 944 without too much trouble.
In addition to these engines, the Porsche 944 can also accept engines from other Porsche models, such as the 928 and 968. However, these engines are larger and heavier, and require more modifications to fit into the 944.