The K&N 33-2489 is a panel-style replacement for the factory element in the 3.5L V6 Acura RDX. K&N's washable, reusable High-Flow Air Filters feature layered, oiled cotton media engineered to improve airflow and capture contaminants. The filters are custom designed to fit into the existing factory air box, so this is a drop-in upgrade rather than an intake system swap.
Compared with a disposable paper element, the case for this filter is long-term value. The manufacturer's listing includes a No-Hassle Lifetime Limited warranty and rates overall filter efficiency at up to 99%. Multiple cotton gauze layers treated with a tacking agent help trap contaminants. Owners on user forums typically describe sharper throttle response rather than large horsepower gains, so the key benefit of these aftermarket filters is better throttle response, not more power. Owners also warn that it should not be used in very sandy or dusty areas.
Fitment is straightforward: the manufacturer lists this 33-2489 for the 2013–2018 RDX V6-3.5L F/I. Owners on user forums note that for 2013+ models, the airbox lid is held down by two latches, which keeps access simple. One airbox screw sits under intake plumbing, so there is an extra step required to access the air filter. Shoppers looking for a washable 2013 Acura RDX 3.5L V6 drop-in panel filter or a reusable cotton gauze intake filter will find this part matches those searches.
The manufacturer lists this filter for the 2013–2018 Acura RDX with the V6-3.5L F/I engine.
The manufacturer states that K&N drop-in replacement filters are designed to install easily into the factory air box, so no airbox modification is called for.
Owners on user forums advise against using it in very sandy or dusty areas. If you regularly drive on dirt or in dust, a standard paper element may be the safer choice.
The manufacturer lists a re-oiling amount of 1.62 oz (48 ml) for this filter. Cleaning frequency depends on driving conditions, so follow the manufacturer's care instructions for cleaning and re-oiling.
Most owners treat this as a manageable DIY job rather than a major install. Owners on user forums say the 2013+ airbox lid opens after undoing its two hold-down latches, and the old element lifts straight out. Basic hand tools may be needed if the intake duct has to be loosened for access. Watch for two common issues. First, the airbox screw covered by intake plumbing requires removing that piece first. Second, one owner reported that the sealing gasket does not seat into the top bevel of the airbox, so after reassembly, confirm the gasket seats fully. The manufacturer's general K&N install hints also advise that when installing the filter into the lid, hold the air filter in place with your index fingers while re-installing the air box lid, and that the tabs on the lid or base must be fully seated into the slots, otherwise the air box could pop open while driving.
