Installation: Professional installation is highly recommended. Note: Please make sure your model's ENGINE and TRIM are as described before purchasing. Made of plastic materials for long-term use. Aluminum Alloy: The injector is made of aluminum alloy, which is resistant to high temperature and not easy to deform or rust. The control of fuel supply is very precise, so that the engine can have the correct air-fuel ratio in any state and always keep the engine running smoothly. This injector, due to its high performance and reliable performance, can be a good replacement part for old or defective injectors Stable performance, low fuel consumption and better power. Make Car Engine runs smoothly without shuddering., Manufacturer: SHUGWA