Air filter.

[IllusionX]

Originally Posted by mrpj

The perceived improvements are probably a pacebo effect.
If these aftermarket, "go faster" addons were of any use don't you think Toyota or any other manufacturer would fit them at the assembly plant?

Actually not. They were built by design, and with tons regulations by the governments.

Now, any increase in air flow (intake, header, exhaust) will bring the power band upon, so you will feel the car being more "alive" when you rev it.

Though, I doubt it decreases fuel consumption to a noticeable level.

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