The car with the custom spoiler is back on ebay. The seller has clearly done some research on the net and dropped the "twin turbo" claim. Unfortunately he did the research on a US site and he now claims that it has a 90:10 torque split.
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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