The K&N 33-2456 is a panel-style, washable replacement for the 5.6L V8 in the INFINITI QX56. The manufacturer says it is designed for high air flow while maintaining filtration levels critical to ensure long engine life. Its cotton gauze media is pre-oiled and ready to drop into your factory air box. The case for buying it is reuse: the manufacturer notes that owners can select it as an alternative to the stock paper filter that requires replacement over and over. Owners on user forums are less certain about gains, with one saying they did not notice a gain in mileage or horsepower, so buy it for reuse rather than for a power figure.
For 2011-2013 QX56 owners searching for a reusable 5.6 V8 air filter or a drop-in panel for the QX56, the manufacturer's blog says the filter's unique shape allows it to fit into the stock air box and seal tightly against it. Fitment information varies across sources, so confirm your model year before ordering. Cleaning is done with one of K&N's Recharger kits, and over-oiling is the mistake to avoid.
The manufacturer's product page lists the 2011-2013 INFINITI QX56 V8-5.6L. The manufacturer's blog covers 2011-2016 QX56 models with the 5.6L engine. Confirm your model year with the manufacturer before ordering.
The manufacturer's install listing for a related 5.6L V8 application says it drops into the factory air box, typically with no tools required, and lists an install time of 5-10 minutes.
Owners on user forums warn that oil can harm intake sensors and say most problems come from over-oiling during cleaning. Use only the amount of oil the manufacturer's kit calls for and wipe off excess before installing.
This is a beginner-level job. Remove the factory cover, lift out the paper filter, and clean the airbox before dropping in the K&N. Owners on user forums recommend clearing debris from the box first, then reseating the cover and its clips so the seal holds. Set the old filter aside for the first cleaning, since the reusable filter needs cleaning and re-oiling later. Let the new filter sit briefly on paper towels to absorb packing oil before installing.
