interestingly I do tend to ride/race with my mouth open a little. the original rx7rr arai's front vent was a straight-through shot of air in front of your mouth. I remember a bug slamming into the back of my throat on a sunday morning ride in NJ about 15 years ago ;)
let me know if you find them. Brian Jefferies (remember him?, fast on a KTM SMR 450) wouldn't race without his and I've always meant to pick one up. need to get off my ass and do it.