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The Ferrari was moving towards a low downforce set-up at Spa
Since the old Hockenheim circuit was reconfigured for the 2002 season, the Autodromo Nazionale Monza stands alone in Formula One as the only truly high-speed circuit on the calendar.
As such, F1 teams arrive in Italy with a Monza-specific aerodynamic and engine package. While this is true for many, if not most, of the teams in the field, nowhere is this package more importantly regarded than at Ferrari.
Pat Fry, Ferrari's technical director, has already stated that "we will also have an aerodynamic and engine package specifically suited to the Italian track. Therefore a lot of work has been done" (via Ferrari.com).
While this is far from unique to the Scuderia—all their rivals will do the same—the emphasis placed on this package will always be more strongly felt at the Italian team.
To McLaren, Red Bull and Lotus, this is just another race—an important one because of the closeness of the championship—but not a special race in and of itself.
Therefore, the amount of focused resources placed on this race alone is very likely to be higher at Ferrari than at other teams, who may be more heavily focused on updates that provide lap-time across all circuits.
Indeed, the Spa rear-wing run by Ferrari was closer to a Monza-spec, low downforce wing than most of their competitors.
Again, this leads nicely into Slide 3...