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2003 Catalunya seems to be the last WRC event with the big clear numbers:

http://rallye-info.com/images/photos/general/2003catalunya/petter_3.jpg

Then from 2003 Rally GB it was the small number...

Surprised Tanak and especially Hyundai dont want the #1 on their car. I thought they'd love taking it off Ogier after all the years he's had it...

Any significance to these number choices ?

Thinking about this more, I realised that all the WRC drivers have a co-driver of the same nationality. So they could just have one larger national flag next to their names instead of two small...

I wish the national flags for the drivers in the side-window were bigger - much quicker & easier to identify.

33 represents his initials EE.

Personal numbers seem important in other motorsports, like Rossi 46 & Block 43.

More for image and marketing than anything else.