Wow, you guys have been busy! Some cool stuff there. I use foam with my kit because it keeps the cost and work to a minimum, and it works as well as any high-zoot restrictions. In fact the name "2 minute mod jet kit " was developed here on this forum several years ago, because we could change the jetting "in 2 minutes". We discussed making adjustable restrictors, and actually Jim Snyder is the first to have done so. Upon reviewing costs, etc on various threads, it seemed that the average connie owner - being a "frugal" guy - would be as happy with foam, as long as it was easy to install and it worked.
What I find most interesting is that when I first introduced the idea of restricting the intake for power, it met with a LOT of questions. Common hotrodding dogma has always been to open the intake, I was advocating to restrict it. Heck, there's even a factory sticker on the intake that says "do not let anything obstruct this airbox intake". Now Here we are some years later, and restricting the intake is just "the accepted way to do things". Funny how that works... Steve