Last year, no fewer than six separate teams won grands prix – a rarity in formula one – and for 2013 the regulations are not changing significantly. “The stability of the regulations is always a condition that favours greater similarity in the performance of the competitors,” team boss Stefano Domenicali is quoted by Brazil’s O Estado de S.Paulo newspaper. “I don’t think anyone will come up with anything critical, as Brawn GP did in 2009 or Red Bull in 2011, to create a great imbalance,” the Ferrari chief added. Steve Nielsen, Toro Rosso’s new sporting director, agrees. “The operation of the exhaust to generate downforce will remain the key this year,” he is quoted as saying. “But the teams basically depleted the possibilities for discovering something really new in that area last year,” he added. It is for that reason that some expect the drivers to have a greater influence than usual on the results in 2013. “Lewis (Hamilton) arriving definitely strengthens Mercedes,” said Sir Jackie Stewart. “He is able to get more out of a car that is not the best than anyone else. “Sorry — Fernando as well,” the triple world champion added. Felipe Massa, however, thinks that even within the confines of the similar 2012-2013 rules, Ferrari still has room to improve. “We finished the last season well,” said the Brazilian. “Not as well as McLaren and Red Bull, but we may have been the fastest in development. “Our margin for progress is still great,” he insisted.