Is the flying lead kit available separately for the Mazda RX-7 FC?

Yes, flying lead harnesses are available to purchase separately. For instance, authorized dealers have confirmed they sell the flying lead harness on its own for standalone systems like the Haltech E6K ⁸.

Speaking generally, it helps to clarify that a "flying lead" harness isn't actually specific to the FC chassis. It is a universal wiring harness provided by an aftermarket ECU manufacturer (like Haltech, Link, or AEM). One end features the proprietary plug for that specific ECU, and the other end consists of unterminated, color-coded wires (the "flying leads"). It is up to you to route, cut, and terminate those wires to your FC's factory sensors, injectors, ignition coils, and relays.

If you are wiring up a standalone ECU on your FC, you just need to order the flying lead harness that matches your specific ECU model. If you are instead looking for something that plugs directly into the FC's factory wiring without cutting and crimping, you aren't looking for a flying lead kit—you need an FC-specific "plug-and-play" adapter or patch harness for your chosen ECU.