Lightweight aluminum CNC machined from 6061 T-6 aluminum 1-inch muffler tip for best effect Universal fit for most cars with straight OEM muffler exhaust. The sound level varies depending on the specifications. Please check the inner diameter of the exhaust port. Please note that the sound level also depends on the exhaust thrust and personal feelings. If the thrust of the individual model is small, the sound is very small, or no sound is produced, such situations cannot be used as a quality issue. For vehicles with small displacement, you can choose a large exhaust port, and for large displacement, you can choose a small exhaust port. The principle of the whistle sound is due to the airflow, and the whistle will sound with a large displacement. 1. Loosen the screws of the Turbo Sound Whistle 2. Place the body of the Turbo Sound Whistle inside the exhaust muffler, with the larger opening facing inside the muffler. 3. Tighten the screws of the Turbo Sound Whistle to prevent the item from falling off while driving. Color is silver. Available in red, blue, gold, silver, and black. Brand new. 13096