Features:Make your vehicle sounds like a turbo vehicleAfter installed this turbo sound whistle, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system or blow off valve.Premium qualityMade of high quality aluminum, light weight and durable.Easy installationEasy to install on the car's tailpipe. This whistle can be installed under 2 minutesUniversal useM size, widely used for all vehicle models. Fit 37mm-48mm tail pipe.Note:The turbo sound whistle is not suitable for extremely curved tail pipes. Please make sure the tailpipe is big and long enough to contain this turbo sound whistle.Specification:Type: Car Turbo Sound WhistleMaterial: Aluminum + ironSpecifications: Make your car sound like a turbo vehicle with the turbo system or blow off valve. Easy to install, no welding or drilling needed. Installation: 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. Screw the screws on the turbo sound whistle to tighten the item so it doesn't fall off while driving. 4. Professional installation is always recommended. Type: Whistle Material: Stainless Steel S Size Diameter: 18mm/0.71", 102mm/4.02" (Approx.) M Size Diameter: 23mm/0.91", 102mm/4.02" (Approx.) Features: Lightweight, Durable, Useful, Easy to Install Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Whistle Installation:1. Loosen the screw on the turbo sound whistle2. Place the turbo sound whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler3. Screw the screws on the turbo sound whistle to tighten the item so it does not fall off while driving4. Professional installation is always recommended