The K&N 33-2530 is a washable, reusable panel air filter built on layered, oiled cotton gauze media, made to drop into the factory airbox of Porsche 911 and 930 3.0/3.5L Turbo models. The manufacturer says the media is engineered to improve airflow and horsepower while still trapping contaminants, and the filter carries K&N's No-Hassle Lifetime Limited Warranty. The real case for it is long-term cost: you clean and re-oil the element instead of buying a new paper filter at every service interval, and the open-element design gives a louder, more direct intake sound on a turbo car.
Set expectations accordingly. Owners on user forums report mixed results. One enthusiast's dyno comparison found the factory paper element slightly ahead on power and filtration, while others choose K&N for reusability and intake sound rather than a measurable gain. Buy this filter for airflow, reusability, and the sound of the intake, not as a guaranteed horsepower upgrade. Searchers looking for a 930 turbo panel air filter, a 911 3.0 drop-in K&N, or a reusable Porsche 3.3 intake replacement will find this part in that category. Confirm your chassis year before ordering, because year ranges vary across sources.
The manufacturer lists this filter for the Porsche 911 and 930 3.0/3.5L Turbo applications, but the year ranges shown across sources differ. Confirm your exact year and chassis with the manufacturer before ordering.
The manufacturer says the filter needs cleaning about every 75,000 miles under normal highway driving. Enthusiasts on user forums advise applying the recharge oil sparingly and blotting excess oil with paper towels before installation so it does not reach the mass airflow sensor.
The manufacturer states that its replacement air filters are designed to work with original equipment vehicle electronics. Keep the original filter if you are concerned about a dealer warranty claim, and confirm coverage questions with the manufacturer.
This is a beginner-friendly, drop-in job. Remove the factory airbox cover, lift out the paper element, and set the oiled K&N in its place. The manufacturer's drop-in guidance for its panel filters calls for a screwdriver and roughly 5 to 10 minutes. Before you install it, follow the recharge kit instructions, then blot excess oil so none migrates toward the airflow meter. Do not over-oil the media. Owners who run an open intake or reroute the crankcase breathers should check that oil vapor is not reaching the intake tract.
