controls the engine's air intake volume

reduces the engine's air intake noise

prevents rain water from entering the engine

prevents dust and other foreign matter from entering the engine

promotes the mixture of air and fuel

reduces intake noise

cools the intake air to a suitable temperature

distributes intake air equally to the cylinders

one

two

four

eight

regulates the intake air flow rate

reduces the intake air noise

enhances intake efficiency

regulates the intake air temperature

optimization of exhaust efficiency

reduction of exhaust noise

reduction of nitrogen oxide in the exhaust gases

reduction of the exhaust gas volume