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 + ironColor: silverHole Size: Approx. 23mm/0.9inPacking List:1 x Turbo Whistler1 x Handle1 x ScrewNote: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. 1Made of high quality metal material, high strength, good stability and durability. 2Upgrade your exhaust sound like a turbo. 3Practical, easy to install and use. 4Professional manufacturing, directly replace your old or broken turbo whistler. 5Suitable for most of car, motorcycle, truck.