After installed this product, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system or blow off valve. Made of high quality aluminum, light weight and durable. Easy to install on the car's tailpipe. Specifications: Color: Black Material: Aluminum Size: XL Diameter: Approx. 3.3cm / 1.3in Length: Approx. 11.5cm / 4.5in Weight: 120g / 4.23oz Package Contents: 1 * Turbo Sound Whistle; 1 * Small Spanner; 1 * Screw Installation: 1. Loosen the on the Turbo Sound Whistle. 2. Insert the the Turbo Sound Whistle into the tailpipe. 3. Tighten the so as not to off while driving. Notes: 1. Please make the tailpipe is big and long enough to contain the Turbo Sound Whistle. 2. Professional installation is always recommended, products damaged through -installation will not be refunded. 3. Please check and re-tighten the regularly. Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.