Performance Car Air Filter Test
K&N Air Filter Test
K&N is a brand we’ve all heard of when it comes to performance filters, and being part of the Mountune Performance ST165 and ST185 packages for the car we chose, the Fiesta ST, we were expecting good things from the K&N. It clearly flowed much better than the original airbox setup (see later in the feature for panel filter testing), and the cotton gauze design is very effective at filtering out dirt, but the supplied 57i kit was the smallest of all the the cone filters tested. This could have been a contributing factor as to why the K&N produced the highest kPa increase (restriction) seen from any of the cone filters we tested.
Restriction (KPA) 1.51
Contact: K&N Air Filters