Exhaust Pipe Roar Maker for Car Auto Exhaust System FEATURES: After installing this product, the pressure from the exhaust airflow creates a sound similar to a turbocharged vehicle with a blow-off valve effect. Constructed from high-quality aluminum alloy for lightweight durability. Designed for easy installation on a vehicle's tailpipe. INSTALLATION: 1. Loosen the bolt on the exhaust whistle device. 2. Insert the device into the tailpipe. 3. Tighten the bolt securely to prevent dislodging during operation. NOTES: 1. Ensure the tailpipe is a straight pipe with sufficient diameter and length to accommodate the device. 2. Professional installation is recommended. Damage caused by improper self-installation is not covered by warranty. 3. Regularly inspect and re-tighten the bolt to maintain secure fitment. SPECIFICATIONS: Color: Red Material: Aluminum Alloy Size S: Fits 1.0–1.6L engine displacement, 32–43mm tailpipe diameter Size M: Fits 1.6–2.0L engine displacement, 37–48mm tailpipe diameter Size L: Fits 2.0–2.4L engine displacement, 44–55mm tailpipe diameter Size XL: Fits engines above 2.4L, 56–85mm tailpipe diameter Additional Notes: - Compatible only with straight (non-bent) exhaust pipes. - Sound produced resembles a whistling or flute-like tone, not a sports car engine sound. PACKAGE INCLUDES: 2 x Exhaust Sound Maker Devices