Universal Car Turbo Sound Whistle Simulator Sound Pipe Auto Exhaust Muffler Pipe Feature: When installed, the exhaust pressure activates the device, producing a turbo-like sound similar to vehicles equipped with a turbo system or exhaust valve. Made of high-quality aluminum alloy for lightweight and durable performance. Easy to install on the vehicle's exhaust pipe. Installation: 1. Loosen the bolts on the Turbo Sound Whistle. 2. Insert the Turbo Sound Whistle into the exhaust pipe. 3. Tighten the bolts securely to prevent dislodging during driving. Specification: Material: Aluminum alloy Type: Modified Exhaust Pipe Applicable models: Universal Whistle Diameter: Size S: 1.8 cm Size M: 2.3 cm Size L: 2.7 cm Size XL: 3.1 cm Note: Sound volume varies by size. Larger sizes generally produce louder sounds. Measure the inner diameter of your exhaust pipe before purchase. Do not install if the whistle diameter plus 1 cm is greater than or equal to the exhaust pipe's inner diameter. Package includes: 1 x Turbo Sound Whistle