I didn't have much of a choice with my setup. The old 4k-c had no external airbox, I whacked a $30 MatriX pod filter on the 4age. In a bad position (right infront of the radiator), so when it's cold I actually get more power than when it's warmed up. Eventually I will make some sort of cold air intake, Probably a longer pipe running from the intake, through the radiator support and on the other side of the radiator, so it gets the cold air before the radiator does.
For $30, this pod filter is great and I'd recommend it, there's no restriction what-so-ever (3" outlet going to a 2" 4age input), and it makes for a very nice induction noise.
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