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What is a core charge Certain products have recyclable components and it is common for core charges or core prices to be applied to these items. Core charges are deposited at the time of purchase and fully refunded once the recyclable part is returned. BD Diesel Performance is an industry leader in making diesel engines run better and improve fuel mileage. All BD Diesel transmissions and components are well known by diesel enthusiasts for their bulletproof construction. Their products are manufactured only from the highest quality materials guaranteeing superior efficiency.