Sebastian Vettel has won the last two World Championships. (Photo: Getty Images)
Formula One champion Sebastian Vettel has predicted a closer fight for the driver's title this year because of new regulations that will prevent his Red Bull team using its pioneering exhaust-blown diffusers.
The English-based team, which has won the last two constructors' titles, rolled out its 2012 car on Monday featuring a stepped nose and a different exhaust to accommodate the rule changes.
Vettel says "it will be difficult because the cars will be fairly similar, with the gaps closer than they have been."
Vettel dominated the 2011 championship, winning the title by more than 122 points from second-place Jenson Button.
Vettel says "the target is obviously to try to do it again, to get everything out of ourselves."