Not sure what you mean by "Peace of Mind" but... The Radiator that rests in all 03/04 Cobras is one of the nicest radiators to ever come stock in a Production car.
The 03/04 Cobra Radiator is made by the same company that makes ALL of the radiators for NASCAR. It features all aluminum contruction (no plastic) and is fully MIG welded.
They company normally uses TIG welders,but couldn't produce enough Radiators to meet FORD's 03 Cobra Dead line. All of the welders were retrained to use new MIG welders and the outcome is outstanding.
It will be many years before anyone has a "problem" with one of these radiators.
Did you need a larger capacity Radiator? Not sure about that. --But you don't have to worry about the quality.