Nick, indeed the 400/01 form refers to the homologation dossier specific to each car. But in the working copy of the reg, this column is where you will find all the technical details. I know, because I work with it.

It's funny because if you see the 2017 LM GTE tech reg available on the FIA website, it has the exact same format as the WRC tech reg, but they left all the details intended "for manufacturers only" completely intact for public release. I don't know if it's an oversight by the FIA but the inconsistency is striking, to say the least.

Just saw the article on Race Tech magazine about the Fiesta. Interestingly, it also talks about the convergence of aero design, and how it could be considered as validation of each team's effort, where no one really has something coming out of the left field, so to speak. That's exactly how I felt when I saw the Polo with the final kit. In fact, the similarities were almost shocking, be it the treatment of the door extension or the rear wing. As reigning champions, I thought it was still fair to consider them as the yardstick for the new cars.

The fact of the matter is, though, I don't believe any rally will be won or lost purely on aero, at least not yet. And I hope we don't get to that point, ever.

Earlier I saw some confusion and misinformation about the central diff, but sadly I'm not at liberty to discuss anything interesting. For me it's just another black box, anyway