FIA allows engine re-equalisation
During the extraordinary meeting of the World Motor Sport Council, which was held in Paris on 21 September 2009, not only the race-fixing case was on the agenda, but the following decision was taken on engine performance:
"Following suggestions that there is a differential between the performance of engines used in Formula One, the World Motor Sport Council has decided that should this be the case, and should the teams wish to eliminate this performance differential, they may be allowed to do so by reducing the performance of the more powerful engines. However, no engine upgrades will be allowed."
FIA statement