Adrian Newey unsure of exhaust rules effect on Red Bull

Red Bull chief technical officer Adrian Newey does not know how much his team's championship-leading car will be affected by new regulations regarding the exhaust system.

Sebastian Vettel secured his sixth victory of the season at the European Grand Prix, but the rules mean the RB7 will have to be modified before the next race at Silverstone on July 10.

Newey also talks about how the rule for 'greener' engines in 2014 will affect the design process.

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