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Please don't tell me you're using an EFIE on a narrowband sensor.
If you want to go lean, get a wideband with an analog 0-5v output.
If you're trying to reduce NOX, go with water injection. AFAIK, it's 50 state legal. I use it on two of my vehicles for performance reasons, but it's function is the same, to keep combustion temperatures down. I'm pushing 19 PSI on a 9.25:1 motor with 87 octane fuel. I'd say it works.
Pick up a shurflo agricultural pump, a brass M1 nozzle from McMaster Carr and the rest you should be able to pick up locally. I'm using an M5 on my Saab, but it only runs under tire shredding power levels.
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