Air filter UGREEN or Fram

Green filter + no airbox is the way to go. It might be a little louder with just the filter, but im not sure by how much. I went years without the airbox lid, its all good

It will make some difference in temp, since it opens up the side of the airbox, even if you leave the lid on. The upswing on temp shouldn't be major, especially this time of year. I run mine with the lid on.

I just installed a green filter on my '16 ST1 and I love it. You get a nice turbo sound when accelerating.

I have the green filter in mine. I like it. Not sure it does much. Though the intake sound gets louder.

I had a green filter on for about 5k miles and I noticed it let a ton of pollen into the intake. I switched back to the OEM paper filter and the pollen was cut down substantially.