question about smog pump

hello everybody, what do u guys know, or think about the bracket/pulley that eliminates the smog pump? Its made in order to remove the pump and to still be using the stock serpentine belt, or so I heard. But does it really give any HP at all? Is my Vette gonna pass emission test like that? Im planning on installing one of those in my '84 soon, but I dont know. Thanks everybody.

this is the pulley kit that I was talking about

http://www.madvet.com/shop?frame=1.842