That blower toy has been around a while like that Nigerian e-mail scam that keeps popping up to tell folks they can "have" some unclaimed millions...
I remember as a kid thinking about gadgets like that and wondering why people didn't put them on all cars. I finally figured out they only work in the movies. Remember "Smokey and the Bandit" and his T/A? When that movie came out everybody wanted to do stuff like that to their cars. If it had been as simple as Burt Reynolds made it look we'd all be jumping gorges for kicks today.
Same deal with Mad Maxx. Of course nitrous has turned into a fairly easy thing to use now, but back then it was still sci-fi for the most part. Still, every kid wanted that big red button to kick in a few hundred extra ponies until they found out only NASA had a budget big enough for it (at that time).
Maybe if they start using these little blowers in the movies somebody will eventually come out with a practical one that will really work that you can just bolt on and go. Cheap.
One of my coworkers and I dug into these a year or so ago. They are bilge blowers for boats. Cost about $40 from a boathouse. They pump out about 100 cfm. 100 cfm wouldn't help make power at idle let alone at any kind of road speed.