Red Bull Racing's Christian Horner insists that when the time comes to choose its power unit for 2019, the primary criteria will be performance. The Milton Keynes-based team will either extend its partnership with Renault or attempt a bold switch to Honda, the beleaguered manufacturer in search of an engineering rebirth with Toro Rosso this year. Red Bull will be in a position to witness first hand Honda's progress this season, but at the end of the day, only sheer performance will sway the team's vote. "I think they have made very good grounds over the winter," says Horner. "We have got a front row seat to see how that product is developing and performing with Toro Rosso....
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