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.Made of high quality aluminum, light weight and durable.Easy to install on the car's tailpipe.Note:1. The size of the sound is different depending on the specifications. The larger the number, the louder the sound. It is best to confirm the inner diameter of the exhaust port before purchase. If the whistle diameter is greater than or equal to the inner diameter of the exhaust pipe after adding 1CM, it will not be installed. At the same time, please note that the size of the sound is also related to the thrust of the exhaust and the personal feeling. After installation, the sound feels too big or too small can not be used as a product quality problem. It is possible that the individual models have small thrust or modified tail drums. The sound is very small or no sound, such a situation can not be used as a quality problem, please know! The last key point: the sound is not like, it is good to listen, this has a lot to do with personal feelings and hobbies!2. For vehicles with small displacement, choose a large one, and a large displacement, you can choose a small one, because the principle of whistle sound is by airflow, the displacement is large, the bigger the whistle, the easier it is to make a sound.3. Please make sure the tailpipe is big and long enough to contain the Turbo Sound Whistle.4. Professional installation is highly recommended, products damaged through self-installation will not be refunded.5. Please check and re-tighten the bolt regularly.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 doesn't fall off while drivingSpecifications:Color: SilverMaterial: AluminumSize: S,Tail Pipe diameter : 32-43mm,Length: 11cm,Displacement : 1000-1600ccSize: M,Tail Pipe diameter :37-48mm,Length: 11cm,Displacement: 1600-2000ccSize:L,Tail Pipe diameter :44-55mm ,Length:11cm,Displacement :2000-2400ccSize:XL,Tail Pipe Diameter:56-85mm, Length: 12cm,Displacement:2400+ccPackage includes:  1Set * Turbo Sound Whistle