Edit: see next post.
Sun glare, snow, smoke, dust, fog... all become thicker as the aspect ratio gets wider. This has a direct effect on visibility: a medium explosion on a 16:9 monitor may look like a firecracker on a 4:3 monitor, and drench the track in fog on 21:9 or multi-monitor displays. Here's how Fusion looks like at various spots, first in 16:10 widescreen then in 3x 16:10 Surround: https://imgur.com/a/mO9pF 1920x12006060x1200
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Can you do something about it, i.e make sure these FX do not scale with the aspect ratio ? This was already a problem in Trials Evo, see here for details: http://www.wsgf.org/dr/trials-evolution-gold-edition/en