Thanks guys......this post cost me a few hundred $$$$$$ . I also ended up with an F4 for my F3L. Got the 25" & wow.......my helmet is quiet again!! Their customer service is amazing & they're knowledgeable since they ryde too. I just went from an RTL to an F3L so wind was a concern with the mini shield. There's no more issue! My F3 is as quiet as an RT now.

I know it may be a higher price point than you expected but the quality & service are as good as it comes.