Anybody heard of these?

Right? or some twisted section of plate you install in the intake runners.
Not that long ago someone had a 12v heated screen that went in the intake under the carb, and that one held my attention for a couple of seconds. :D
Never heard of it doing anyone any good though.
Hmmmmmmmmmm, I seem to remember as if it were a bad dream last nite a certain 2.8L Xbody GM engine that wouldn't run for S**T as soon as the
choke started opening because ...........................