Universal Car Turbo Sound Whistle Simulator Sound Pipe Auto Exhaust Muffler Pipe 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.   Specifications: Color: Black/Blue/Red/Sliver/Gold Material: aluminum alloy Size: S, suitable for 1.0-1.6 displacement, exhaust pipe diameter 32-43mm < about 71g > Size: M , suitable for 1.6-2.0 displacement, exhaust pipe diameter 37-48mm < about 87g > Size: L , suitable for 2.0-2.4 displacement, exhaust pipe diameter 44-55mm < about 102g > Size: XL , suitable for displacement above 2.4, exhaust pipe diameter 56-85mm < about 136g > Please note the required model and color when placing an order, otherwise it will be sent randomly Package includes: 1PC * Turbo Sound Whistle   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.