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thanks for that the black box is seperate to my afm its only a couple of cms long and wide with 2 white wires on it going into the wiring for the afm

hi all i have just bought a 306 with a stainless steel backbox and big induction kit i have two questions the air filter has a black box on it with two wires coming out does any body know what the wires and box are for? and my second question how much will my bhp be increased by ?