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Adding a 2nd cone wouldn't lean it out or flow more than adding 6 cones would, or even smply running the car without an air filter at all would. Because if you're using the stock MAF and stock tubing up to where the stock airbox was, THAT is what limits airflow capacity once yu've gone to a less restrictive / non-stock air filter or air box. Once you've improved flow (assuming the stock box is flow restrictive) you've improved it all you're going to without changing to a bigger MAF and bigger tubing or a different intake manifold.
The only way to creat a lean condition that the computer can't compensate for with a stock tune using stock MAF/tubing would be forced induction with either a supercharger or super-sophisticated ram air setup. IMO.
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