Helmut Marko clarifies Christian Horner remarks on Ferrari's engine
Christian Horner reflects on the Ferrari front wing
Charles Leclerc's arrival at Ferrari can push Sebastian Vettel to 'new level' - Horner
Horner says that Sebastian is "a rock within the team"
The Italian outfit made significant strides with its engine performance heading into 2018
Red Bull Team Principal thinks Seb will fight to the end
Seb's current contract with Ferrari is available until the end of the year