Radiator efficiency has much to do with the amount of surface area that the coolant runs through ("Duh!" I know, bear with me . . .). The simplest way to increase the efficiency of this part of the cooling equation is to increase the number of rows (or cores) of tubes moving the liquid from the top of the radiator to the bottom, thus increasing the surface area available for the coolant to flow through. Typically, I've found that you can squeeze a new triple core radiator (or a 3 row cross section) into the same space provided by the stock Ferrari radiator. I have done 4 radiators this way, and have not had the experience of needing any more than a triple core radiator in any of my personal cars. That said, they do make 4 core radiators which I understand work fantastically, but I've yet to find a quad-core radiator which fits between the side brackets of any Ferrari radiator I've done, which is the narrowest part of the radiator. If you really want to go with the quad-core radiator, you can still do so by having the outer 4cm be 3-core, and the inner portion be a 4-core (yes, you can mix and match widths if you'd like). Just make sure that if you do this you leave enough room on the sides of the radiator to clear the brackets on the inner wheel fenders of some cars (if present).
BUT WAIT! There's more! There is this nifty style of radiator called "dimple core" radiators, in which all of the cooling tubes are covered in dimples, which provide even more surface area, and are thus more effective cooling aids. I've found that you can order dimple core radiators in either the continuous fin or serpentine cores. (FYI, I've been told that the serpentine core radiators are more compact and effective coolers, but I've got no data to back that up).
THERE'S STILL MORE! Each continuous fin radiator can be ordered with or without tiny louvres in the fins, which when present can yet again increase the surface area of the radiator. The radiator will still appear stock.
When all that's said and done, your Ferrari may overheat anyways in heavy traffic unless you put a high velocity fan on it. I've typically had the radiator guys solder on mounting brackets for such a purpose. It's a much better solution then using the plastic mounting hardware that slots through the radiator, which can loosen and vibrate against the radiator, causing damage. It's also totally removable and reversible, which is good news for you die-hards out there!
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AND YET ANOTHER FACTOID! The radiator was invented by an Englishman named Fred Radiator in 1687, and used as a method to keep his barley stock from freezing in the wintertime.
. . . OK, I admit I made that last factoid up. But the rest is more or less accurate, based on my experiences.