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It has recently been reported that leaked vehicle chassis codes for the new Audi RS6 had the output from its twin turbo V10 engine at 571hp, or 426kW, which certainly will give the M5 and M6 a run for their money. Recent information from a whistle blower at Audi, however, has put this figure in possible doubt. The supposed reliable source claims that the 571hp will only be the specified figure Audi will market the car with. True output will be upwards of 600hp, with 610hp (455kW) pegged as the most likely figure. BMW claim that the 335i has 300hp, when in fact it is much closer to 360hp. It is entirely likely that Audi is taking no chances with the new RS6 and even BMW’s excellent 500hp V10 motor will struggle to compete with this kind of power output.