2025 Gasoline 4WD This piece is a turbo sound simulator (Turbo Sound Whistle) that is installed in the car's exhaust. Noon Function: This whistle emits a sound similar to a turbo whistle when exhaust gases pass through it. Material: It is usually made of lightweight aluminum. Installation: It is easily installed inside the exhaust outlet, and its sizes vary (e.g., M, L, XL) to fit different exhaust pipe sizes. Noon +3 Shop