Kamui Kobayashi says diffuser rule changes hurt Sauber in second half of 2011
|By Pablo Elizalde||Tuesday, December 6th 2011, 10:34 GMT|
Kamui Kobayashi believes his Sauber team was hurt by the rules changes imposed during the 2011 season, something that he believes was the reason for the Swiss squad's difficult second half of the campaign.
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