– Christian Horner is hopeful that his Red Bull team can be a "real challenger" in 2017, given the changes engine supplier Renault has made to its unit over the winter.Red Bull notched up four successive world titles under the previous V8 era, but has been restricted to just five race victories with turbo V6 power units, introduced in 2014.However, for 2017, Formula 1's controversial engine token system has been scrapped, meaning manufacturers are able to overhaul their units and bring developments as they wish.Speaking in a pre-season video, Horner commented: "It's a brand-new engine for this year, a change of philosophy – [Renault has] had a big winter."We're...
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