General Motors Modified Tail Throat Whistle Motorcycle Sound Simulator Automobile Turbine Whistle Exhaust Pipe Turbine Whistle Features: Easy to install, beautiful appearance, very fashionable, low cost, is the first choice for decorative car. The length of the product is only the length of the whistle, not the length of the fixed frame Widely used for all vehicle models. Under the premise of suitable installation size, better to choose a larger size. For small output volume car, better to choose a large size, for large output volume car, better to choose a little bit smaller, because the principle of whistle soundis to rely on air flow, large displacement, the greater the whistle, the more likely to make a sound. Specifications: Material: Aluminum alloy Color: Black Size: S/M/L/XL Size S is suitable for displacement of 1.0-1.6, and the exhaust pipe diameter is 32-43 mm M size is suitable for displacement of 1.6-2.0 , and the exhaust pipe diameter is 37-48 mm The L size is suitable for displacement of 2.0-2.4, and the exhaust pipe diameter is 44--55 mm XL size is suitable for displacement above 2.4, and the exhaust pipe diameter is 56-85 mm Packing list1pc Diipative Muffler Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. It is only suitable for small cars with 1.0-1.6 displacement