Formula One champions Ferrari expect to be more competitive in Sunday's British Grand Prix after losing ground to Williams in the last two races.
"We have made progress," technical director Ross Brawn told the Ferrari website on Monday after the team tested a new aerodynamic package last week that they said produced an improvement in performance.
Brawn said tyre supplier Bridgestone had also come up with some new ideas.
"Bridgestone brought some interesting solutions for the coming races; nothing revolutionary but definitely a significant improvement," he said.
Williams have won three of the last four races and are now only three points behind Ferrari in the constructors' championship.
Ferrari said they had covered 4,252 km last week in the last tests before an agreed ban to the end of August.
"We were able to see an improvement in the performance of the F2003-GA, as well as some interesting developments in terms of tyre performance," said team boss Jean Todt.
"We can therefore prepare to tackle the race at Silverstone in reasonably optimistic mood, while not forgetting that our main rivals will be very competitive."
Ferrari's five times world champion Michael Schumacher won last year's British Grand Prix.