You can always get the UNI 1" vent filters and install them into the lid. I did this and they work great. You can put your hand over them at idle and feel a little air being sucked in, then crack that throttle and there is a rush of air moving over your hand. I didn't think it would work so well but it does. And best yet, they use small foam inserts so you can remove and wash them. They come in packs of 6 for $12 in Denniskirk. Good way in increase air flow and filter it at the same time.