Have always been running afe dry filters in all my cars. I swear by these products. Easy to clean nd maintain...depends on region though...so I pulled the trigger nd picked one up for the nx...seems the filter is compatible w quite a few different models other than toyota or lexus...lolxz

aFe POWER 31-10218 Magnum FLOW Pro DRY S Air Filter

http://afepower.com/afe-power-31-10218-magnum-flow-pro-dry-s-air-filter#overview


Cheapest on amazon that I've found. I hope it fits. *fingers crossed*

 

The RX uses the same filter as the NX