In 1991, 348 chassis number 82881 was delivered to Ecurie Francorchamps for the purposes of evaluating the 348's suitability for competition use, and its development set the stage for the 348 GT Competizione production models to come near the end of the model run. Outfitted with composite doors, polycarbonate competition windows, and experimental exterior and underbody aerodynamic treatments, the development mule was designated as 348 tb/f, with the f designating the car's creator, Francorchamps, and weighed a total of 1,165 kg (2,569 lbs). The car was frequently run at Spa Ferrari race events, but did not campaign formally within any major series.Foskett, Robert. “Ferrari 308, 328 and 348 The Compete Story”
