Features: Enhances your motorcycle's sound and riding experience with this electronic exhaust valves, allowing you to control and amplifying the exhaust note at the push of a button for thrilling acoustics. Available in 51/60/63/70/76mm sizes to fit various motorcycle models and engines, this stainless steel exhaust valves features electronic switches control, and high temperature resistance for performances. Ideal for motorcycle enthusiasts and riders seeking to customize their bike's exhaust sound and systems, catering to all types of motorcycles and styles. Use this exhaust valves during rides to effortlessly switches between quiet cruising and powerful roaring modes, enhancing your biking adventures with dynamic sound control. Crafted from quality stainless steel, this exhaust valves ensures long lasting functionality and easy installation, making it a top choices for upgrading any motorcycle exhaust systems. Specifications: Component: Stainless Steel Pattern: 51mm/60mm/63mm/70mm/76mm Size: 2in/2.25in/2.5in/2.75in/3in Note: The 51mm size only has 4 holes, other sizes are equipped with 6 holes. Package Includes: 1 Set Electric Exhaust Control Valves note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.