Universal Car Turbo Sound Whistle Simulator Sound Pipe Auto Exhaust Muffler Pipe Feature: With this product installed, the pressure blown from the exhaust will make your vehicle sound like a turbo vehicle with a turbo system or exhaust valve. It is made of high-quality aluminum, which is lightweight and durable. Easy to install on the exhaust pipe of the car. Install: 1. Loosen the bolts on the Turbo Sound Whistle. 2. Insert the Turbo Sound Whistle into the exhaust pipe. 3. Tighten the bolts to prevent them from falling off during driving. Specification: Material: aluminum alloy Type: Modified Exhaust Pipe Applicable models: Universal Whistle Diameter: Size S 1.8 cm, Size M 2.3 cm, Size L 2.7 cm, Size XL 3.1 cm Note: The volume of the sound varies by specification. The higher the number, the louder the sound. It is best to confirm the inner diameter of the exhaust port before purchasing. If the diameter of the whistle plus 1CM is greater than or equal to the inner diameter of the exhaust pipe, do not install it. Package dimensions: 1 * Turbo Sound Whistle