Features: The aluminum whistle, which is attached to the exhaust pipe, makes a sound through the airflow from the exhaust pipe. Make your car sound like a turbo vehicle with the turbo system or blow off valve. Easy to install, no welding or drilling needed. Wrench and black screw is used to fix the item. Lightweight, durable, useful, long service life. Suitable for any car model, beautiful, very stylish. Installation: 1. Loosen the screw on the turbo sound whistle. 2. Place the turbo sound whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. 3. Screw the screws on the turbo sound whistle to tighten the item so it doesn\'t fall off while driving. 4. Professional installation is always recommended.