PowerCore air filters have twice as much media area per given volume than competitive, conventional pleated filters so you get the same capacity in a smaller package. Air enters one end of the filter, flows through, and exits the opposite end of the filter, which Donaldson says can be exploited to create less-restrictive intake systems. The manufacturer also claims superior efficiency and soot-holding capacity for its unique Ultra-Web media. Estimated price: $15 to $100.
