The K&N 33-2170 is a washable, reusable panel filter made of layered, oiled cotton gauze, built to replace the stock paper element in the factory airbox. The manufacturer states it is designed for high airflow while keeping filtration at a level that protects engine life, and rates it at up to 99% efficiency. The manufacturer also estimates that a reusable K&N can save you up to $125 vs. purchasing multiple disposable filters, which makes it a better long-term value than a cheap disposable replacement. Enthusiasts should know that power gains from a drop-in filter alone are modest, and the manufacturer does not publish a horsepower figure for this part.
Fitment is listed for the Lexus GS300 1998-2005, IS300 2000-2005. Because listed years vary across sources, confirm your exact model year and body style with the manufacturer before ordering. The filter measures 9.688 in (246 mm) long, 8.188 in (208 mm) wide, and 1.313 in (33 mm) tall. Owners on user forums have noted that the filter needs periodic oiling, which is a real ownership cost compared with dry-element alternatives. Searches for an IS300 drop-in filter, a washable 33-2170 airbox replacement, or a reusable high-flow IS300 air filter will lead to this part.
The manufacturer lists this filter for 2000-2005 IS300 models. Owners on user forums report that the intake on later IS300 generations is laid out differently, so verify your model year and intake setup before buying.
Yes. The manufacturer describes it as an oiled cotton element and supplies sealing grease with the filter. The manufacturer specifies a re-oiling amount of 1.19 oz (35 ml) for cleaning and servicing.
No. The manufacturer states that the filter is designed to install easily into the factory airbox, so no cutting or custom hardware is needed.
The manufacturer lists a No-Hassle Lifetime Limited Warranty on this filter.
The filter is designed as a direct swap: remove the stock element from the factory airbox and seat the K&N in its place, then close the airbox and confirm the lid seals properly. Oil the filter with the manufacturer's recommended oil before installing it, and keep the included sealing grease on hand. The manufacturer's installation instruction sheet, linked on its product page, has the full procedure. Owners on user forums suggest checking the fit and seal carefully after installation, since an unsealed filter can let unfiltered air reach the engine.
