To be honest the front arms might even be particularly for this track, not something we see back on the car again: I recall hearing and seeing on RC Racing TV that the track was bumpy and had very rough sections in it, even with pebbles here and there. I can imagine that not using gullwing arms in that particular situation really helped Jörn to get a more consistent drive - Even the wedged shape of it suggests they've made an attempt there to make it slide over the pebbles or shoot them up and away (I do know for sure that's not typical Durango styling)
It's interesting to see the rest, too: No Spec B DIMEC chassis for Jörn but 'good old' alu, new rear tower with more mounting options and in front of the shocks, different mounts for the wing, completely different gear cover (which indeed looks a lot like an RB6 one)... and that makes you wonder how butchered that rear end really is
