Product DescriptionK&N Universal X-Stream Clamp-on RX-4990
pros and cons (Rating: 3 out of 5) good: built in velocity stack/funnel in neck, stop inside neck for proper mounting and extra surface area ontop of filter.
bad: the mesh is bonded/painted on both sides of media, which also flakes off on the inside, into the engine. some of the wire mesh also comes out of the rubber base it is bonded into, running the risk of being sucked into engine. poor filtering, inside the neck of the filter builds up grime after about 5K miles.