The path taken by intake air is

• carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders
• air cleaner - carburettor (or throttle body) -intake ports - intake manifold - cylinders
• air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders
• air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders