Just an update. The guy on LegacyCentral figured out his mistake and did it right this time. His initial reaction was "Holy Crap!!!!!!!".
So the power mode switch mod works on the Legacy too! I guess it will probably work on all 4EAT Scoobies.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II