I have never been a fan of foam filters.
They seem overly fragile and the ITG filter seems vulnerable to disaster when confronted with water.
If I did my calculations correctly, the K&N filter as used on the dual Weber / PMO carbs will flow 568 or so CFM each. That for each side. Let say your 2.5 spins 20,000 rpm this should still be enough. Just kiddy but you get the point.
K&N flow well, filter well and are reusable.
Plus I think they look great.
