The phrase "go as far as to say X" means it is still reasonable to say X, but not anything further. For example, you could go as far as to say that his girl friend is pretty , but it would be too much to say that she was one of the most beautiful women in the world .
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aska_leego as far to sayThis is not correct. It should be go as far as to say or go so far as to say. It means to go farther in what you say, to expand what you are saying even farther in the same direction, to dare to add a more expansive or extreme opinion compared to what has already been said, in the belief that it is
Doctor DThe phrases are pretty much interchangeable. "Go so far as to say" may be slightly preferable to "go as far as to say."answers.com freedictionary.com seem to think both are acceptable. I know that 'so far as' sounds much better to me than 'as far as' after a negative.