Specifications:Easy-fitting on the vehicle muffer, it reproduces the sound of a turbo engine car.Made of high quality aluminum material.Easy to install.Type: Turbo Sound WhistleMaterial: AluminumSize Details:[Our Size S]: Tail Pipe Diameter: 32mm - 43mm/1.26" - 1.69", Displacement: 1000-1600cc (Approx.)[Our Size M]: Tail Pipe Diameter: 37mm - 48mm/1.46" - 1.89", Displacement: 1600-2000cc (Approx.)[Our Size L]: Tail Pipe Diameter: 44mm - 55mm/1.73" - 2.17", Displacement: 2000-2400cc (Approx.)[Our Size XL]: Tail Pipe Diameter: 56mm - 85mm/2.20" - 3.35", Displacement: >2400cc (Approx.)Caliber: 1.7cm/0.67" (Approx.)Notes:Universal fits for most cars with a straight OEM muffler exhaust, doesn& 39;t fit the elbow muffer.Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Turbo Sound Whistle2 x Accessories