1 S11-1129010 THROTTLE BODY 2 473H-1008024 WASHER-THROTTLE BODY 3 473H-1008017 BRACKET-FR 4 473H-1008016 BRACKET-RR 5 473F-1008010CA INTAKE MANIFOLD BODY ASSY-UPR 6 473H-1008111 EXHAUST MANIFOLD 7 473H-1008026 WASHER-EXHAUST MANIFOLD 8 S21-1121010 FUEL RAIL ASSY 9 473F-1008027 WASHER-INTAKE MANIFOLD 10 473F-1008021 INTAKE MANIFOLD-UPPER 11 473H-1008025 WASHER-PIPE AIR INTAKE 12 480ED-1008060 SENSOR-AIR INTAKE TEMPERTURE PRESSURE 13 JPQXT-ZJ BRAKET-CARBON BOX ELECTROMAGNETIC VAVLE 15 473F-1009023 BOLT - HEXAGON FLANGEM7X20 16 473H-1008140 HEAT INSULATION COVER The intake system is composed of air filter, air flowmeter, intake pressure sensor, throttle body, additional air valve, idle speed control valve, resonant cavity, power cavity, intake manifold, etc. The main function of the air intake system is to deliver clean, dry, sufficient and stable air for the engine to meet the needs of the engine and avoid abnormal wear of the engine caused by impurities and large particle dust in the air entering the engine combustion chamber. Another important function of the air intake system is to reduce noise. The air intake noise affects not only the passing noise of the whole vehicle, but also the noise in the vehicle, which has a great impact on ride comfort. The design of intake system directly affects the power and noise quality of the engine and the ride comfort of the whole vehicle. Reasonable design of silencing elements can reduce the noise of subsystem and improve the NVH performance of the whole vehicle. Automobile exhaust system refers to the system that collects and discharges exhaust gas. It is generally composed of exhaust manifold, exhaust pipe, catalytic converter, exhaust temperature sensor, automobile muffler and exhaust tail pipe. The automobile exhaust system mainly discharges the exhaust gas discharged by the engine, and reduces the exhaust gas pollution and noise. Automobile exhaust system is mainly used for light vehicles, mini vehicles, buses, motorcycles and other motor vehicles. Exhaust path To reduce the noise of the sound source, we should first find out the mechanism and law of the noise generated by the sound source, and then take measures such as improving the design of the machine, adopting advanced technology, reducing the exciting force of the noise, reducing the response of the sound generating parts in the system to the exciting force, and improving the machining and assembly accuracy. Reducing the exciting force includes: Improve accuracy Improve the dynamic balance accuracy of rotating parts, lubricate moving parts and reduce resonance friction; Reduce the flow velocity of various air flow noise sources to avoid excessive turbulence; Various measures such as isolation of vibrating parts. Reducing the response of the sound generating parts to the excitation force in the system means changing the dynamic characteristics of the system and reducing the noise radiation efficiency under the same excitation force. Each sound system has its own natural frequency. If the natural frequency of the system is reduced to less than 1 / 3 of the frequency of the excitation force or much higher than the frequency of the excitation force, the noise radiation efficiency of the system will be clearly reduced.