OK, but if you add more oxygen, the O2 sensor detects your running lean, so it adds more fuel, compensating for the effect. And, bang, more power. If it didn't work, then howcome all the dyno's in the country see more power with any and/or all of these simple breathing things: cat-back exhaust, mufflers, headers, high-flow filters, new intake pleniums, bigger injectors/carbs, etc. They work big-time, and just look at turbos (more air, so more fuel, so more power. The engine is just a big air pump)
Someone wanna back me up?