SincreetaliThis whistle will make your car look like a turbo vehicle with the turbo system or the blow off valve. It is easy to install, no welding or drilling required. Features: Make your car look like a turbo vehicle with the turbo system or the blow off valve. Easy to install, no welding or drilling required. A wrench and a black screw are used to fix the item. Lightweight and convenient to use. Specifications: Material: Aluminum alloy Size: M, XL (optional) Color: Red, Blue, Black, Silver, Gold (optional) Item Size: M: Length: 100mm, OD: 23mm / 0.9, ID: 21mm / 0.8 XL: Length: 115mm, OD: 35mm, ID: 31mm Item Weight: M: 60g / 2.1ounce XL: 100g / 3.5ounce Package Size: 130 * 50 * 50mm / 5.1 * 2.0 * 2.0in Package Weight: M: 75g / 2.6ounce XL: 120g / 4.2ounce Installation: 1. Loosen the screw of the turbo sound whistle. 2. Place the turbo whistle body into the exhaust muffler with the larger opening facing the inside of the muffler. 3. Screw the screws on the turbo whistle to tighten the item so that it will not fall off while driving. 4. Professional installation is always recommended. Package includes: 1 x Whistle