The K&N 33-2498 is a washable, reusable panel filter for the 2.4-liter four-cylinder Honda Accord. The manufacturer says it is designed for high air flow while maintaining the filtration levels needed for long engine life. Its layered, oiled cotton media is intended to capture contaminants while supporting horsepower gains. The case for paying more than a disposable paper element rests on reuse: it is engineered to last the life of the vehicle and carries K&N's lifetime limited warranty. Searches like "reusable 2.4 Accord drop-in air filter" or "K&N 33-2498 washable panel filter" point to exactly this use.
Gains over stock are modest and should not be oversold. The manufacturer claims a horsepower benefit but does not publish a figure in the material reviewed, so none is stated here. Owners on user forums are mixed: one reported never seeing a power increase after running K&N filters on several cars. Owners also note that cleaning and re-oiling is manageable, though the drying time was inconvenient. Because it is a direct panel replacement, you keep the factory intake and avoid the cost and fitment questions of a cold-air kit.
The manufacturer lists it for the Honda Accord L4-2.4L F/I from 2013 through 2017. The "13-14" in the product name is narrower than that listing, so confirm your model year and engine before ordering.
The manufacturer states the filter is designed to increase horsepower but does not publish a number in the materials reviewed. Owners on user forums report mixed results, with some seeing no measurable change.
This is a drop-in swap with no modifications needed. Per K&N's general drop-in guidance, make sure the filter is seated in the groove on the lid and that the lid is properly seated onto the air box base. Clean the sealing surfaces first. Clip pressure will be slightly higher than with an OEM foam-seal filter, but if the pressure seems excessive or the air box bends noticeably, stop and recheck the installation. If the lid is hard to close, disconnecting the air intake tube from the air box lid can make it easier to maneuver. No specific tool list for this part was confirmed, so check your air box fasteners before starting.
