Quote:
Originally Posted by XwChriswX
The foam piece is something you want. In the event of water being taken in the main filter, air is drawn from these filters instead to prevent hydro-lock. Ask anyone with injen intakes in a damp climate. They will ask for these lol
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I know, but I read this also allows hot engine air to be sucked in.
And this is the reason you don't see anyone using the foam piece.