Size XL is suitable for displacement over 2.4, exhaust pipe diameter 56-85mm 130g Pronunciation principle: Whistle to relieve pressure noise, aluminum whistle clipped to the exhaust pipe, sound through the airflow through the exhaust pipe Durable Material: Made of durable material, corrosion and abrasion resistant. Lightweight. Easy to install on the car exhaust pipe. Easy Installation: 2 minutes to complete the installation, 1. Loosen the Turbo Bolts; 2. Insert the whistle into the exhaust pipe; 3. Tighten the bolts so that they do not fall off while driving. Make your vehicle sound like a turbo vehicle with a turbo system or wastegate. Universal: This exhaust valve is suitable for most vehicles and can be used in cars and motorcycles. It is the ideal accessory for vehicle modernization. Friendly reminder: The turbo whistle is not suitable for extremely curved exhaust pipes. Small displacement cars choose large displacement cars; and the displacement is very important, one is because the sound of the whistle is emitted through the airflow. The greater the displacement, the easier the whistle is to sound.Products from Chunchuan's store