Stock O2 sensors are narrowband.
They're useless once you're away from stoich.
IE, useless for what you're trying to do.
10:1 will read the same as 14:1 from the stock O2 sensors. That is, they'll read rich. The same level of rich.
You should totally get a Brumby, and then come pick up the Subaru Liberty GTB I have here.
EJ25 Turbo, 6 speed manual from the sti (just no dccd), and the good rear diff.
Drop all that into a Brumby and go have fun!
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