Motorcycle Racing Exhaust System Muffler Assembly Fit For GY6 50cc Scooter. Specifications: Product Name: Exhaust System. Color: Black / Silver / Red / Blue. Material: Stainless steel. Muffler length: 35.5cm / 14. Muffler diameter: 90mm / 3.5. Pipe OD: 25mm / 1. Pipe ID: 22.5mm / 0..88. Pipe mounting to manifold: 50mm / 2. Fit: For GY6 50cc Scooter. Quantity: 1 Pcs × Exhaust System. Features: - Muffler has replaceable screw in silencer plug. - 6 mounting holes to mount pipe to muffler. You will only use 3 bolts, but the 6 holes allow you to position the outlet pipe. - Inlet pipe with 4 bends. 1st bend is 4.5 from manifold, 2nd bend is another 4. A 6 run to the 3rd bend and another 6 to the -muffler attachment. - To brackets on pipe as pictured. - Kit contains muffler mounting bracket. - Kit contains muffler mounting bracket insulator. Package Included: 1x Exhaust System With Accessories. Note: 1. We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement. (1inch=2.54cm) 3. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. 4.The instruction is not included in the package.Professional installation is Highly Recommended.