K&N Performance Air Intakes
If you are looking for a guaranteed horsepower gain in your Mazda 3, K&N Air Intakes are the answer. K&N Air Intakes are engineered to smooth and straiten the air path to your engine.  Combined with K&N’s high flow air filter, this air intake system allows virtually unrestricted air flow to your engine resulting in increased horsepower that you will feel.

For the 2004 to 2009 Mazda 3 models with 2.0 liter and 2.3 liter engines. Testing shows that these air intake systems gain 5.2 horsepower @ 4500 RPM.
K&N intake systems for the Mazda 3 are complete cold air intakes that come with K&N's famous Million Mile Limited Warranty. . They are designed with a two piece intake tube which can be configured as either a cold air intake or a short ram intake.

Not CARB legal. Check your local laws before ordering. Some states besides California require CARB legal parts.