I am the farthest thing from an expert on towing. However, my understanding is that the towing capacity of a vehicle is based upon a multitude of factors that include the vehicle's geometry, weight, engine HP, frame, axles, hitch, wheels and tires. By exceeding the recommended limits, you may induce a failure in any of these components. Simply adding a performance mod would not necessarily make for safe towing. Towing mishaps can be catastrophic not only for the driver of the tow vehicle, but also for anyone else who may have the misfortune of being near you. My suggestion would be don't do it.
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