The K&N 33-2484 is a pair of washable, reusable panel filters for the 991-generation Porsche 911 flat-six. They use K&N's High-Flow design, with layered, oiled cotton-gauze media intended to raise airflow while still trapping contaminants. Each box holds two elements, so both factory intake filters can be swapped in one job. The case against a cheaper disposable paper filter rests on reuse: the manufacturer says servicing intervals can reach up to 50,000 miles depending on driving conditions, and it backs the filter with a lifetime limited warranty. Gains are less certain. The manufacturer claims more horsepower, but user forums are split, with some owners seeing no measurable change and others reporting a modest improvement.
Verify fitment before ordering. The manufacturer's product page lists 2012-2014 3.4L applications, while its Porsche 911 category page shows 2012-2016 3.4L, 3.6L, and 3.8L variants under the same part number, so confirm your model year and engine by VIN. Owners on user forums also caution that oiled filters can foul mass airflow sensors on some Porsche models, so keep oil application light and follow a consistent cleaning routine. Typical searches for this part include 33-2484 991 3.4 high flow air filter, 911 Carrera 3.8 washable intake filter, and 991.1 oiled panel filter replacement.
The manufacturer's product page lists 2012-2014 3.4L H6 applications, while its Porsche 911 category page shows 2012-2016 3.4L, 3.6L, and 3.8L variants under the same part number. Because the manufacturer's own listings differ, confirm your exact year, engine, and VIN with the manufacturer before buying.
The manufacturer states that servicing intervals can reach up to 50,000 miles depending on driving conditions. It recommends its Recharger cleaning kit (part 99-5050) for cleaning and re-oiling the filter.
The manufacturer claims a horsepower increase, but no specific gain figure has been confirmed. User forums report mixed results, ranging from no measurable change on a dyno or track to a modest improvement.
This is a drop-in swap inside the factory airbox, so most owners can handle it with basic hand tools, though access and clip seating take patience. The manufacturer's general panel-filter guidance advises disconnecting the intake tube if it makes the airbox lid easier to maneuver, and seating the filter in its groove before fastening the lid. K&N filters can require firmer clip pressure than a foam-sealed OEM filter, so if clip pressure seems excessive or the airbox begins to bend, stop and recheck the seating. Keep the screws and clips together, because missing hardware can let the filter shift. One owner on a user forum reported that a 991S may need bodywork removed to reach the filters, so check access before starting. I could not locate the 33-2484-specific install sheet, so follow the manufacturer's instructions included with your box.
