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 sound like a turbo vehicle with the turbo system or blow off valve. Made of high quality aluminum, lightweight and durable. Easy to install on the car's tailpipe. Installation: 1. Loosen the bolt on the Turbo Sound Whistle. 2. Insert the Turbo Sound Whistle into the tailpipe. 3. Tighten the bolt so as not to fall off while driving. Specifications: Color: Black / Blue / Red / Silver / Gold Material: Aluminum alloy Size: - S, suitable for 1.0-1.6 displacement, exhaust pipe diameter 32-43mm (~71g) - M, suitable for 1.6-2.0 displacement, exhaust pipe diameter 37-48mm (~87g) - L, suitable for 2.0-2.4 displacement, exhaust pipe diameter 44-55mm (~102g) - XL, suitable for displacement above 2.4, exhaust pipe diameter 56-85mm (~136g) Package includes: 1 x 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.