YEONGAM, South Korea - Niki Lauda did not sound convinced about the legality of Red Bull's car as rumours of illegal traction control continued to rumble around the Korean 2013 F1 GP paddock.Ferrari's Fernando Alonso, however, insisted he did not think the 2012 champion team was cheating. He told Spain's Marca newspaper: "People talk a lot without knowing exactly what they are seeing or hearing. Ferrari will not protest." Sports newspaper Marca's Marco Canseco said Ferrari was not even planning a mere clarification from the International Automobile Federation.'DON'T SPECULATE'Mercedes' Lauda, however, gave a less convincing answer when asked his thoughts about the Red Bull "system". He told Osterreich newspaper: "Red Bull did some software testing before Singapore. I know because the federation said Red Bull needed to change something about it. They did that and then everything was apparently fine."Told that his answer did not sound completely convincing, Lauda insisted: "If you cannot prove anything, you should not speculate." Stay with Wheels24 for the 2013 Korean GP weekend.