Exhaust　Manifold
It is the isometric 4-2-1 type that can aim at an increase of torque from the low and the high-speed area.  The pipe diameter and the layout for smooth emission of exhaust gas are carefully selected to realize an increase of power in the entire area.  The glossy pipe of stainless and the fully machined flange are well worth seeing, too.  It not only is installed, but also is a hallmark with peculiar tastes that gives you the feeling of satisfaction.