Trumpet Type Universal Exhaust Pipe Pressure Relief Valve Simulator Whistle Sound (L) Features: 1. Make your vehicle look like a turbo vehicle with the turbo system or a shut-off valve. 2. Made of material, has good corrosion resistance. 3. After installation, it will enhance the hierarchy sense of your motorcycle, full of elegant style. 4. Exquisite workmanship, stylish design, easy installation. 5. Universal fit for motorcycles, ideal for motorcycle modification, a perfect replacement. Specification: Condition: Color: Silver Material: CNC aluminium alloy Size: S, M, L, XL (optional) Fitment: Universal Size Tail Diameter Cylinder Capacity Length S 32-43cm / 12.6-16.9in 1000-1600cc 11cm / 4.3in M 37-48cm / 14.6-18.9in 1600-2000cc 11cm / 4.3in L 44-55cm / 17.3-21.7in 2000-2400cc 11cm / 4.3in XL 56-85cm / 22-33.5in 2400+cc 12cm / 4.7in 1. The general assembly of all models of vehicles does not meet the pipeline entrance of 2.5 inches or more.2. light aluminum products3. Make your car sound like a turbo engine turbo system or shut-off valve4. 6061 T-6 aluminum CNC mechanization5. "Admission for better results"6. The installation is simple, you can install it in less than 2 minutes. Package list: 1 x Turbo Sound Simulator Whistle 1 x Wrench 1 x Screw Note:The inner diameter of the L size is 27mm