AFE purchased an N55 specifically for R&D so you guys should see some more products being offered in the next few months here. They've just released their direct replacement filters today:
This AFE filter outflows the factory intake by 33%, increases performance and MPG. Constructed with 100% polyurethane on all four sides, this high flow, oiled OE replacement performance filter will outflow stock paper filter for improved horsepower and torque. Five layers of progressively finer mesh cotton gauze media provide maximum airflow for best performance results. Washable and reusable for multiple cleaning cycles, the tall open evenly space pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.