2004 STI Engine into 2000 RS Engine Swap

This blog is to chronicle my 2004 STI engine into 2000 RS swap. This swap is in progress and I am currently trimming down the bulkhead wiring harness from the STI. This involves identifying all the engine related wires and cutting out everything else.

Everything else includes things like the radio, ABS system, wiper controls, door wires, air bags and heater controls. I will be using the RS transmission so the DCCD stuff is out too. (Hmm, I should make a complete list…). Eventually, I’ll be left with an engine only harness that plugs into the STI ecu (using the STI plugs). I will then cut the wires from the RS harness for the non-engine functions and solder them to the STI plug wires. There are a few exceptions to this rule (I think) so for now I’m only cutting what I know for sure I don’t need.

All I know about how to do this swap I’ve learned from the NASIOC forums, the powerlabs.org site and hours spent reading the 04 STI service manual. I’ll post links soon. This blog will duplicate some of that information and include specifics for an 04 STI swap.