Injectors have about 4-5k miles on them tops. From lethal performance before ID1000's started to dominate the market. These are stock size (EV6) same as the stock injectors in the 11-14 coyotes. no spacers needed, just hook'em up and go. Still have the flow testing markings on them. Looking for 400 shipped. Will support over 700 rwhp. Only reason for selling is I changed intake manifolds and decided to go with larger injectors. These were used on pump gas only, no E85 or other corrosive fuels. Easy to tune. Lund had no issues tuning with them. Let me know if you have questions