These 7 year warranty injectors come with a set of 6 Injectors with new connector tubes. An additonal $600 will be charged for the refundable core. 
This is the best re-man on the market. We began re-manufacturing years before any other company in the USA so we have learned a few things.  They feature only high quality parts and a 7 year warranty VS other companies 1 year coverage. FDI injectors have a substantial cost savings over new Bosch and over 3 times their warranty period.   Extensive processes and time go into building these.  Please call us if you are sending us your injectors for re-manufacturing because there would be no core charge in this case.