What is the deffrence between a 97 318 manifold and a 96 318?

The primary difference between the 1996 and 1997 318 manifold lies in the design and emissions regulations. The 1997 model features a revised intake manifold that is optimized for better airflow and fuel efficiency, in response to updated emissions standards. Additionally, the 1997 version may include differences in mounting points or sensors. Always check compatibility if considering a swap between the two years.