Cold air filters and Vortex air generators ?? do they work.......?

I see these advertised, a little round unit with these fins you put in the air intake pipe of the air filter and was wondering if anyone know anything about these. They claim to increase air flow by creating a vortex and thus increasing mileage and horse power. Also does a cold air filter hooked to a stock motor... show more I see these advertised, a little round unit with these fins you put in the air intake pipe of the air filter and was wondering if anyone know anything about these. They claim to increase air flow by creating a vortex and thus increasing mileage and horse power. Also does a cold air filter hooked to a stock motor give any noticeable gain in power/fuel economy? It's for a 2.0 DOHC CR-V
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