It really depends on how well the intake was designed from the factory. For some reason, nobody ever wants to hear the engine, so they have to design it to be super quiet. All the quiet takes away power. I know on the Mazda 6, intakes can give 15+ hp at the wheels. But that is because it leans the factory tune out as well. Either way, good gains can be had from the intake modifications. After all, more air in equals more power to the wheels!
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