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You cannot "port" your stock throttle body. All you can do is change the interior and smooth it down. When it boils down to it, the butterfly is still the same size, and in essence will take in the same amount of air. The idea of "porting" your throttle body is to make it bigger, but you're not doing that....

The bottle neck effect does not go away. You don't make your TB take in any more air. So how can you call this "porting" ?