Features: 100% Brand New and High Quality Car turbo sound simulator whistler muffler, making your vehicle sound like a turbo vehicle with the turbo system or blow off valve Universal fits for all the vehicles models Made of high quality and lightweight aluminum, durable to use Easy to install SIZE XL:  Suitable for more than 2.4 displacement, exhaust pipe diameter 56-85 mm Specifications: Material: Aluminum Color: Silver Quantity: 1pc Weight: 130g (Approx.) Package Contents: 1 × Auto Exhaust Muffler  How to install: 1.Loosen the screw on the Turbo Sound Whistle 2.Place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler 3.Tighten the screws on the Turbo Sound Whistle so it doesn't fall off while driving 4.Professional installation is recommended