How Much Horsepower Would I Gain Cutting Off The Cat Converters And Putting On A Flowmaster

My 3.0 liter ford enginge is being rebuilt right now and i am debating on wether or not to cut off the catylitic converters or leaving them. And i already ordered the flowmaster exhaust. So how much of a gain should i expect? ((O almost forgot! With cold air intake Maybe????))

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