Feature: 1. Beautiful appearance, wonderful choice for auto car modification. 2. Made of quality aluminum alloy material, safety and durable to use. 3. Easy installation, directly replacement, installed on a modified car turbo. 4. The exquisite design allows it to be used as an ornament as well. 5. This is a whistle that simulates the sound of a turbine's pressure relief , which is attached to the exhaust pipe, makes a sound through the airflow from the exhaust pipe. Specification: Condition: 100% Brand New Item Type: Turbo Sound Whistle Material: Aluminium Alloy Color: Blue Size: S, M(Optional)Installation Instructions: Clamp on the tail end of the exhaust pipe. Tips: 1. If the car is installed inside the tail throat, it may be that the car's airflow is not large enough. It is not enough to concentrate the whistle. The parents can install it outside and use the wind. Because the wind's airflow is bigger than the car's airflow, it's easier to blow. 2. Product inspection can use the mouth to blow the air into the tight whistle, and you can hear the whistle. If you can blow the product for normal products, you can contact us to return the goods. It is the problem of the exhaust force of the car that can be blown and not rang after installation. 3. About the size selection: First, please measure the inner diameter of your own exhaust pipe. Under the premise of proper installation size, try to choose a large size. For vehicles with small displacement, choose a large size, and a large displacement, you can choose a small one, because the principle of whistle sound is by airflow, the displacement is large, the bigger the whistle, the easier it is to make a sound. Package List: 1 x Turbo Sound Whistle Note: Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.