A refundable core charge is a standard part of purchasing a remanufactured turbo like this one. You must return your old turbo (the "core") in an acceptable condition to receive a refund of your deposit. The specific core charge amount should be confirmed with your dealer at the time of purchase. — The remanufacturing program relies on a steady supply of good, rebuildable cores to keep costs down for everyone. When you buy this turbo, you are essentially buying the service and new parts, and temporarily "renting" the hard parts (housings, wheels) until you return your original. Your old turbo must be returned in the box the new one came in. To receive a full core refund, the old unit must be free of non-repairable damage, like broken housings or shafts, from external events.