Christian Horner reckons there is even more to come from his driver Sebastian Vettel as he chases a fifth World title in 2014.
The 26-year-old dominated the latter half of this year's Championship.
On his way to a fourth successive Drivers' Championship title, the German claimed won every grand prix since F1 returned from the summer break giving him a run of nine consecutive wins.
That was yet another record for the Red Bull driver, who is leading the race with bookmakers Paddy Power to take a fifth title next season.
"I don't think he can quite believe what he has achieved," Horner told Autosport.
"To have nine consecutive victories in one season, and to have been the only driver since July to have won a grand prix is quite outstanding.
"The manner in which he has won as well has been so dominant. We have really seen him come of age this year, and I have said it before that he will continue to improve.
"We have yet to see the best of him, but I think we are starting to see that now."
Vettel's success, though, is down to more than just the German's prowess, it also includes Red Bull's incredible form.
Technical guru Adrian Newey has designed a Championship-winning car four years in a row, leaving Red Bull as the odds on favourites to take a fifth double in 2014.
"We have worked closer, harder, and more effectively than any year," Horner added.
"We are always looking inwardly and Adrian and the technical team have done a brilliant job.
"But all of the departments, all of the support, all of the unsung heroes that you don't get to see or hear about, they have all gone that extra yard and that is what has helped us achieve this kind of result."
Any reproduction, publication or redistribution of this material without the written agreement of 365 Media Group is strictly forbidden.