Features: After installed this turbos sound whistle, the pressure blowing out of your exhaust will make your vehicle sounds like turbos vehicle with the turbos system or blow off valves. Crafted of high qualitys aluminum, light weight and durability. 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 turbos sound whistle is not suitable for extremely curved tail pipes. Please make sure the tailpipe is big and long enough to contain this turbos sound whistle. Specifications: Materials:Aluminium Color:Silver,Red,Blue,Black,Golden Size:(10.26cm/4.03'' long),( 10.3cm/4.05'' long),(11.6cm/4.57'' long),(12cm/4.72'' long) Package Includes: 1x Turbos Sound Whistle note: Before purchasing, please confirm the inner diameter of the exhaust port. 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. The size of the sound is also related to the thrust of the exhaust and personal feelings. After installation, if the sound feels too loud or too low, it cannot be considered a product quality issue. Some models may have very low or no sound due to the low exhaust thrust of the original car or the modification of the tail drum, and such situations cannot be considered a quality issue. 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.