Red Bull advisor Helmut Marko has revealed that the championship leaders are to introduce an upgrade for this weekend's Chinese Grand Prix, despite a 100 per cent record so far in the 2011 F1 season.

Sebastian Vettel has taken victory in both Australia and Malaysia to take an early lead in the drivers' championship, while Red Bull are also the team to beat in the race for the constructors' championship with two races run.

However, the team came under extra pressure from its rivals in Malaysia this past weekend which suggests that the performance advantage many felt the Milton Keynes-based squad holds isn't as big as initially believed, with Marko revealing that the champions will respond in Shanghai.

"[We're] ahead, yes, but not far," he told the official F1 website, "and should our opponents make a lucky move things might look pretty different pretty fast.

"We will introduce an upgrade [in China]. What, I cannot say, but one thing is clear - at these lofty heights of competition standing still is deadly and means a step back in Formula One."

While Vettel has enjoyed a perfect start to his season, team-mate Mark Webber has endured a more troubled opening to the year, with a KERS issue restricting him to fourth place in Malaysia; one place higher than he managed on home soil at Albert Park.

However, despite Vettel having the early advantage in the standings as a result, Marko insisted that there was no number one within the team and the two drivers remained on a level footing.

"Both drivers are absolutely equal," he said. "I just remember last year: Vettel was leading the first race and then dropped back to P4 due to a minor issue on the car. In the second race he was leading, unrivalled, only to find that a bolt broke on his suspension and he retired.

"So technical fortune can be pretty cruel and overall I would say that Sebastian's misfortune at the start of the 2010 was bigger than Mark's at the two first races this year - but that will even out in the course of a long season."



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