The exhaust manifold group consists of the exhaust manifolds and the turbocharger mounting studs.
The exhaust manifold utilizes a wear coating on the sealing surfaces of the manifold sections for improved sealing characteristics and reliability.
The N14 engine series also incorporates the towerless capscrew mounting boss design exhaust manifolds. The capscrew mounting boss “towers” have been removed from the manifold castings and replaced with spacers. The spacers insulate the capscrews from the hot temperatures which results in more consistent and controlled clamp loads at the manifold-to-cylinder head interface.