Description: This is a whistle of the turbo pressure, the aluminum whistle on the exhaust pipe, and the air through the exhaust pipe to make it sound. Features: Brand New and high quality. Made of aluminum alloy material, light weight and durable. Universal fitment for all vehicles models. Easy to install, can be installed under 2 minutes. Periodically (after 500-1000km) check and re-tighten the bolt and rock nut. After installed this product, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system or blow off valve. Specification: Condiiton: 100% Brand New Color: Black, Gold, Silver (Optional) Material: Aluminum alloy Applicable: General purpose Model: S, M, L (Optional) Size: (whistle caliber): S number 18mm, M number 23mm, L number 27mm Installation: Firstly, loosen the screw on the Turbo Sound Whistle. Then, place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. Finally, screw the screws on the Turbo Sound Whistle to tighten the item so it doesn't fall off while driving. (Professional installation is always recommended) Package Included: 1 x Turbo Sound Simulator Whistle 1 x Small Spanner 1 x Screw