Red Bull has slammed reports it is flouting the rules as Sebastian Vettel stamps his dominance on the 2013 season.
After Singapore, former F1 team owner Giancarlo Minardi raised doubts about the German's RB9, saying its handling and engine tone reminded him of traction control.
"Utter nonsense!" Red Bull's Dr Helmut Marko told the German newspaper Bild.
Reports have suggested Red Bull might actually be mimicking the banned 'blown exhaust' era with a clever engine mapping solution.
Bild said F1's governing FIA would not comment.
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