Core Return: Exergy requires that all cores be returned within 30 days from original purchase of product. If you fail to return the core(s) within 30 days, you will be charged in full for the core(s) ($150 per injector). Cores that have missing and/or damaged component(s) will not receive credit. To avoid this, please package your cores well in an organized fashion with the Injector Process Form inserted (see examples and find Injector Process Form on the shipping and returns page). If you have an outstanding circumstance, please contact us.