Why does the Porsche 944 USA EEUU have 150 hp and the European version have 163 hp?
Where could I increase my 944 horsepower 13 hp? Thanks

 

As you can see from the attached jpg, the primary difference is the compression ratio. (There is also a different ECU specified for the cars).

If you have a USA car, the cost of upgrading for 13 bhp is expensive. The money is typically better spend on tires, suspension, and track time.

 

And how could I recover those 13 hp?

 

Install high compression pistons and the ECU from a high compression engine.