I have been thinking about ways to acheive a leaner mixture, can't see any way apart from changing the sensor for a wider range one and adding some electronics as the sense basically switches at the mixture it is aiming at. What would happen if I connect the first sensor to the 2nd? may need some more electrical mods, but the CAT would remove some oxygen and the car would adjust the fuel down to keep the same level as I had before the CAT?
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