Specifications:Material: Aluminumspecification:S: 1.0-1.6 displacement， exhaust pipe diameter 32-43 mmM: 1.6-2.0 displacement， exhaust pipe diameter 37-48 mmL: 2.0-2.4 displacement， exhaust pipe diameter 44-55 mmXL: 2.4 above displacement， exhaust pipe diameter 56-85 mmColor: SilverAccessories: screwdriver a screw 2Features:The product is the same as the whistle sound， suitable for any car， easy to install， nice， very stylish， low cost， is the first choice of car decoration.Precautions:The product is only available in straight exhaust pipe， the exhaust pipe bends not installed.Note that the sound is not a sports car Oh! It's Flute sound.Note: we have 4 models:S/M/L/XL， please leave me a note， so that I can ship the right model to you， otherwise I will ship the most popular model to you.Product List;1 * exhaust pipe whistle; 1 * Screwdriver; 2 * Screws