Part Number Match: Direct replacement for fuel injector part number 6646906 as specified in the product title listing. Engine Compatibility: Designed to fit vehicles equipped with the 4JB1 engine model referenced in the item description. Vehicle Application: Intended for use in Mustang models requiring this specific professional replacement component for proper function. Product Function: Serves as a functional substitute to restore standard fuel injection without altering equipment design. Listing Reference: Corresponds to the 1112100 BB identifier and 4JB1 fuel injector details provided in the source title., Manufacturer: EVMJPmYGQ