The car has also undergo aerodynamic changes and improvements to the traction control system. (en.wikipedia.org)
The front air dam is subtly different, but there are no other aerodynamic changes or mass reductions. (hybridcars.com)
We've seen loads of unofficial lap records being broken over the course of the F1 season so far, thanks to the wider tyres and drastic aerodynamic changes. (wtf1.com)