I think its a bit early to say Vettel is favourite, last lap on Sunday will give a better indication of how everyones going.
Remember, the cars are very different this year. Exhaust, aero and crash test rules have dictated change.
It depends whos adapted best.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i