I need to make a harness for an STi engine installed in a MY93 Impreza. Not the engine harness, but the bulkhead harnesses that connect the engine harness to the ECU.

My question is this: are the WRX harness connectors compatible with the STi ECU? I will modify the WRX piece to work if the connectors fit. Anybody know?

Thanks in advance.

Mike McBride

I am going through a similar situation. My solution will be to use a matched set of connectors, and re-arrange the wires on one side of it to match the existing side. Make sure you use the set (whether the old or new) that has more pin slots. ;) And be very careful with your pin locations. Not only could getting one wrong hurt the electronics, it would take forever to track down the mistake.

Yes I agree with your approach. But my question is will WRX harness connectors fit the STi ECU? Very likely they do, but is that a fact? If this can be verified, then I will purchase a recycled WRX harness and make the new conversion harness.

Comments please. Thanks.

Mike M