

Newer Front Wing I think.

new rear body work + exhaust. (note the flo vis near the wheel ont he floor body work)
That rear bodywork looks beastly. And it's nice to see how they haven't copied the diffuser design from BR
AWN too. You have to admire how fast they have improved that car.
Also really glad to see how fast Williams actually are! Its going to be such a good season this year. Three british teams, two british drivers and a very tight grid.
Jesus, only eight days left until Fri Practice!
EDIT : Found a pic of the new diffuser McLaren used today (19th March)

Now
that looks beastly.
"He's obviously gone in for a wheel change. I say obviously because I can't see it" - Murray Walker