What were the changes made to the cars

hi reichenbach... yes Ferrari and mclaren are the undisputed kings of formula 1 but this season something has gone terrible wrong with both the teams....the change is that added extra weight by the KERS.....it increases the weight f the car by 180 kilo....and only these two teams are having this in their car....in fact for today's race in silver stone only Ferrari has this system....this added weight is effecting the cars performance......and it is also the driver who makes a lot of difference.......schumi was very aggressive and a very good driver he knew the right tactics....and if you see the others are not as aggressive as him....he was a perfect combination......and i must also say that every team has its own downtime and know these two are facing their downtime....but they will surely come up.....