i cant explain this very well my self, but modshack has explained this better than i do. His expainlation is in the links i have posted above. It is dyno confirmed and proven that z will run too lean if u have full bolt-on and intakes (escpecially with aftermarket CAI). The optimal range for z is 12.6 to 13.2. Even Tony from FI has recommended not to go aftermarket CAI.
You should ask Modshack about MAF issues as i am not too technical in this.
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