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This sub-harness is used with our pre-made PRO harnesses when using an aftermarket ECU with an external IAT sensor PLUS a MAP sensor that is built into the ECU or connects to the ECU with an aux sub-harness (not provided by Wiring Specialties).
Example: Apexi Power FC D-Jetro - this ECU uses an external MAP sensor with a separate aux harness, but still requires IAT input.
Plugs right into the Wiring Specialties PRO engine harness.
NOTE: Using this Sub-Harness REQUIRES ECU PLUG PINOUT CHANGES. Contact Tech Support for details.