I am not aware of any OEM filter that is not able to flow more than the engine intake requires ... most have a healthy safe extra capacity.
Dirt on the outside of an air filter has the effect of reducing the size of particles that can pass through the filter, in essence the sediment acts as a filter media, so it's a mistake to seek out a super clean one, or to replace it too soon. As long as it's flowing enough air, leave it alone.
Even if there is a restriction beyond what is required to run the motor, the ECM will compensate with fuel delivery to maintain the correct air:fuel ratio. So you can err on the side of caution and still not experience a huge performance penalty.
I know that goes against the typical BITOG forum reader's fastidious instincts but that's the way it goes. Read the manual, do what it says, and avoid jumping the gun.
Aftermarket filters work well but are typically unnecessary. Buy one because you want to, but it isn't going to offer any performance improvement, unless you've significantly increased the air pump capacity of the motor, where a higher flowing model might not be available from the OEM catalog. Even then, other work on the intake will be required, and you may be defeating some torque improvement the OEM has built in via Helmholtz Resonance optimization.
