Turbo Sound Exhaust Muffler Whistle Exhaust Sound Custom 1 piece New Compatible muffler inner diameter: 37-48mm Material: Aluminum Applicable vehicles: Universal type Size M approx.: Outer diameter 24mm, Inner diameter 23mm, Total length 10cm, Weight 75g Colors: 5 types A: Black B: Gold C: Red D: Silver E: Blue Please comment with your desired color. Features: 1. Made of aluminum, lightweight and durable. 2. Easy to install. 3. After installing this product, the pressure from the exhaust port will make it sound like a turbo system or a turbo with a blow-off valve. *1 The loudness of the sound varies depending on the engine displacement, and there are individual differences. *2 Please check the size to see if it can be installed on your car's muffler before purchasing. Installation instructions: 1. Loosen the screws on the main body. 2. Insert the main body into the inside of the exhaust muffler. 3. Face the side with the larger opening towards the inside of the muffler. 4. Finally, tighten it further to prevent it from falling off while driving. 5. Check the screws regularly for looseness. As this is an overseas product, there may be minor scratches. If you are looking for a perfect product, please refrain from purchasing. *About shipping method Due to shipping costs, it will be shipped without a box and with simple packaging. Please understand this beforehand. *About transactions We strive for honest and courteous communication, so please feel free to comment with any questions. Thank you very much.