We are selling this unit outright, so a core exchange is not needed. The alternator itself carries a 3 YEAR WARRANTY against issues with craftsmanship or components. Additional expenses such as labor, towing, etc. are NOT covered under the warranty. As with all alternators, please make sure to install this unit into a vehicle that has a fully charged, load tested battery, as well as clean and tight electrical cables, terminals, grounds, and pigtail alternator harness. We cannot warranty units that are damaged due to issues with the vehicle itself or negligence on behalf of the installer. We have been in business for over 35 years and are known for our honesty, quality, and excellent customer service. Rest assured that in the unlikely event that an issue should arise during the course of this transaction, that we will do our best to provide a satisfactory resolution.