Features: 1.Made of high quality metal material, high strength, good stability and durability. 2.Upgrade your exhaust sound like a turbo. 3.Practical, easy to install and use. 4.Professional manufacturing, directly replace your old or broken turbo whistler. 5.Suitable for most of car, motorcycle, truck. Specification: The turbo whistler is an aluminum device which easily install inside your car or truck's muffler exhaust pipe. It will make your car sound like it has a fake turbocharger. In some cars letting off the gas pedal releases backpressure in the muffler making the car sound like it has a small blow off valve. Features: 1.Made of high quality metal material, high strength, good stability and durability. 2.Upgrade your exhaust sound like a turbo. 3.Practical, easy to install and use. 4.Professional manufacturing, directly replace your old or broken turbo whistler. 5.Suitable for most of car, motorcycle, truck. Specifications: Material: Aluminum alloy + iron Color: silver Hole Size: Approx. 23mm/0.9in Packing List: 1 x Turbo Whistler 1 x Handle 1 x Screw Note: Different specifications, the sound produced is different, the larger size, the greater is the sound. Customers should better confirm the inner diameter of the exhaust port before purchasing. PackageList: