Vehicle sounds like a turbocharged car: with this turbo sound whistle installed, the exhaust pressure will create a sound similar to that of a turbocharged vehicle. HIGH QUALITY: Made from high-quality aluminum alloy, it is lightweight and durable. EASY TO INSTALL: Designed for simple installation on most vehicle exhaust systems. This whistle can be fitted in minutes using the included tools. Universal M size fits tailpipes from 37mm to 48mm in diameter. Note: The Turbo Sound Whistle is not suitable for sharply curved tailpipes. Ensure the exhaust pipe is sufficiently straight and long enough to accommodate the whistle. Installation instructions: 1. Loosen the screws on the turbo sound whistle. 2. Insert the body of the whistle into the exhaust muffler with the larger opening facing inward. 3. Tighten the screws securely to ensure the whistle remains in place during operation. 4. Professional installation is recommended. No refunds will be issued for damage resulting from self-installation. Specifications: - Material: Aluminum alloy - Colors available: Blue, Red, Black, Silver, Gold - Gross weight: S 0.071KG, M 0.081KG, L 0.108KG, XL 0.136KG - Net weight: S 0.070KG, M 0.080KG, L 0.108KG, XL 0.135KG - Fitment: Universal - Package includes: 1 x Turbo Tail Whistle, 1 x L-wrench, 1 x Thimble