High quality, perfect fit. High reliability and stability. Enhance your car performance. Great replacement for your original one. Easy Installation Professional installation is Highly Recommended. In the event the item should fail due to manufacturing defects during intended use, we will replace the part by free. Some product can expose you to chemicals including Chromium (Hexavalent Compounds). Which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to California goverment website, you can search California P65Warnings. Most of the items are after-market, so, no installation instruction will be included. For replacements, please notice us within 5 days after you receiving the item. We will try our best to serve you better! California Prop 65 Warning. Gasket or Seal Included.