Features: After installed this turbo sound whistle, the pressure blowing out of your exhaust will make your vehicle sounds like turbo vehicle with the turbo system or blow off valves. Made of high quality aluminum, light weight and durable. Easy to install on the car tailpipe. It is better to confirm the inner diameter of the exhaust port before purchasing. If the whistle diameter plus- 1CM is greater than or equal to the inner diameter of the exhaust port, it will not be installed. 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. Specifications: Material:Aluminium Alloy Color:Silver,Red,Blue,Black,Golden Size:S (10.26cm/4.03'' long),M-( 10.3cm/4.05'' long),L(11.6cm/4.57'' long),XL(12cm/4.72'' long) Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Turbo Sound Whistle