The K&N 33-2345 is a drop-in panel filter built from layered, oiled cotton gauze, the washable, reusable High-Flow design the manufacturer uses across its line. K&N says the media is engineered to improve airflow while capturing contaminants, and that the filter is designed to increase horsepower. The case for paying more than a disposable paper element is lifespan: the manufacturer states the filter needs cleaning only about every 75,000 miles under normal highway driving, so one purchase can replace several paper changes. Owners searching for a reusable IS 350 intake filter, a 3.5L V6 airbox upgrade, or a washable K&N drop-in for a stock airbox will find this is the core use case.
Fitment is where buyers should slow down. The manufacturer's product page lists the filter for the Lexus IS250/IS350 from 2005 to 2009, the GS350 from 2007 to 2009, and the GS430 from 2006 to 2007, while its engineering blog describes fit in the factory airbox of the 2006 to 2013 Lexus IS 350 3.5L V6. Those ranges conflict, so confirm your model year against the manufacturer before ordering. The element measures 1 inch tall with an outside footprint of 9.563 by 9.313 inches, and the manufacturer specifies 1.2 oz (36 ml) of re-oiling compound for each cleaning.
The manufacturer's product page lists the IS250/IS350 for 2005 to 2009, while its engineering blog cites the 2006 to 2013 IS 350 3.5L V6. Details vary between these manufacturer sources, so confirm your exact year and engine with the manufacturer before buying.
The manufacturer says the filter needs cleaning about every 75,000 miles under normal highway driving, which it equates to roughly five years at 15,000 miles per year. Driving in dusty conditions will shorten that interval.
Yes. The manufacturer states it was designed to fit inside the factory air box of the affected Lexus models, so the stock airbox and intake tube remain in place.
This is a bolt-free, drop-in swap: remove the factory paper element, clean the airbox sealing surfaces, and seat the K&N in its place. The manufacturer's install hints note that disconnecting the intake tube from the airbox lid can make the lid easier to manoeuvre, and that some K&N filters are easier to fit into the lid first. Hold the filter in place with your fingers while the lid is refitted so it does not fall out, and confirm it sits in the lid groove before fastening. Clip pressure will be firmer than with the stock foam seal, so if the airbox begins to bow, stop and recheck the fit. Overtightening is the most common way to crack an airbox, so take it slowly.
