As described in the other thread, I ride without too. I did it shortly before it got too cold to ride, so I only rode a few hundred kilometers.
No noticeable negative effects.
I completely agree with izibizi. The cover does not hold the filter in place and it’s still perfectly in place after removing the cover. It really looks like this is how it’s meant to be and the engineers designed the lid to comply with noise regulations and still make it easy for us to let our Huskies breathe freely.