Toffa93 Posted December 4, 2023 Report Share Posted December 4, 2023 Hi All, Recently bought a 2004 Model STi Forester with the EJ255 engine and i happen to have a late model GX4 Monsoon ecu sat gathering dust... Would it be a huge step forward fitting this and getting it properly tuned over the stock ecu? Would i get away with a jumper harness from Boomslang or similar? Or am i best getting a spare plug set and making a loom up? Thanks! Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 4, 2023 Report Share Posted December 4, 2023 If it is DBW and AVCS cams then you wouldnt have enough IO to run it. Quote Link to comment Share on other sites More sharing options...
neil brown Posted December 4, 2023 Report Share Posted December 4, 2023 Sg9 sti has DBW and AVCS as well Moonson not suitable as above have stated Quote Link to comment Share on other sites More sharing options...
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