This is a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. Specifications: Weight: 20G Size: As the picture shown Color: As the picture shown Package: 1 Piece Notes: Please allow 0.1-0.5cm difference due to manual measurement. Please check carefully to make sure whether the item matches to your vehicle or not. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. Instruction is not included. Dear buyer,Welcome to our store. if you want buy more than we listed, please contact us.Have a nice day