Features: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.Installation:1. Loosen the bolt on the Turbo Sound Whistle.2. Insert the the Turbo Sound Whistle into the tailpipe.3. Tighten the bolt so as not to fall off while driving.Notes:1. Please make sure the tailpipe is big and long enough to contain the Turbo Sound Whistle.2. Professional installation is highly recommended， products damaged through self-installation will not be refunded.3. Please check and re-tighten the bolt regularly.Specifications:Color: GoldenSize: XLMaterial: AluminumDiameter: Approx. 3.3cm / 1.3inLength: Approx. 11.5cm / 4.5inWeight: 120g / 4.23ozPackage includes:1 * Turbo Sound Whistle1 * Small Spanner1 * Screw