Which generations of DD13/DD15 share an Asymmetrical turbo?

The correct answer highlights that the GHG17 and Gen 5 generations of the DD13/DD15 engines are designed with an asymmetrical turbo. An asymmetrical turbocharger is engineered to improve efficiency and performance across various engine loads and speeds. This design allows for better airflow characteristics, enabling faster spooling and a broader range of operating conditions, which can enhance engine responsiveness and fuel efficiency.

In the context of the DD13 and DD15 engines, the adoption of an asymmetrical turbo in these generations reflects advancements in turbocharger technology aimed at meeting stricter emissions regulations and improving overall engine performance. The GHG17 and Gen 5 engines demonstrate a commitment to not only meeting regulatory demands but also enhancing the driving experience through improvements in power delivery and efficiency.

The other options refer to generations that either do not incorporate this specific turbo design or do not exist within the listed frameworks, emphasizing the technological evolution that occurs in engine design and performance to satisfy both regulatory standards and market demands.