Features: 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 resembles a turbo pressure relief sound. Specification: Condition: 100% Brand New_x000D_ Item Type: Exhaust Pipe Whistle_x000D_ Material: Aluminum Alloy _x000D_ Color: Black PackageList: 1 x Exhaust Pipe Whistle1 x Screwdriver1 x Screw Note: 1. If the car is mounted inside the tailpipe and does not ring, it may be because the air flowing in the car is not large enough and concentrated enough to blow up the whistle, which can be installed outside to take advantage of the wind._x000D_ 2. Because wind currents are bigger than car currents, they blow more easily._x000D_ 3. Product testing can be used to close the mouth whistle into the air mouth hard blowing, whistling can be heard. Can blow for normal products, can not blow contact us for return and replacement._x000D_ 4. Can blow and can not heard the sound after installation is the problem of automotive exhaust thrust._x000D_ 5. Whistle sound is the principle of air flowing, displacement, the larger the whistle, the more easy to produce sound. _x000D_ 6. Regarding size selection: First, please measure the inner diameter of the exhaust pipe of your car. If the installation size is appropriate, try to choose a larger one. For cars with small displacements, you should choose a larger one, or a larger displacement. You can choose a smaller one, because the principle of whistle sound depends on airflow. The larger the displacement, the larger the whistle, the easier it is to make a sound.