I've always called them "noisemakers," but this website is calling them "
blowouts." I am wondering if that would be a confusing term even in context - a "blowout" can also be a tire failure ("We had a blowout on the freeway in heavy traffic, and I thought we were going to be killed") or a advertising term for a big sale ("Hurry on down to Ray's Used Cars! We're having our Annual Fall Blowout!")