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Haltech 2500 dbw Conversion Subaru ej207

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Hello,

I'm looking to convert a my02 usdm WRX with ej207 swap engine to DBW using haltech 2500.

I have a few options:

-run usdm ej257 harness plug and map. Repin car harness and repin unused sensors for dbw. (Benefit is a mostly complete map that needs some scaling and sensor style changes) bonus of this is being able to swap to factory ecu for emissions testing

-run WRX harness plug and use aux harness to I/o for pedal and tb. Make changes in map for Dbw (unsure of complexity) con- basically a huge hassle to emissions test.

- maybe you have an option I'm not thinking of?

TIA for the input!

Eric