The K&N 33-2343 is a washable, reusable drop-in panel filter for the 2.0L four-cylinder Honda Civic Si, and the manufacturer also lists it for the Element's 2.4L engine. Its K&N filters are pre-oiled and ready to drop into the factory air box, and the media is built from multiple layers of premium cotton gauze treated with a tacking agent. Compared with a disposable paper element, the appeal is longevity: the manufacturer markets it as a lifetime filter, so you clean and re-oil it at service intervals rather than replacing it each time.
For a buyer chasing throttle response on a stock-intake Si, this is a bolt-free upgrade that keeps the factory airbox in place. Installation is a manageable DIY job, but the lid is where it gets fiddly. The manufacturer notes that the pressure needed to fasten the clips with a K&N filter will be slightly more than with an OEM type that has a soft foam seal, and it warns that forcing a misaligned lid can crack the airbox. Search terms this part answers: Civic Si drop-in air filter, K&N 33-2343 install, washable performance air filter Civic Si 2006-2010.
The manufacturer lists the Civic Si 2.0L for 2006 through 2010 and the Element 2.4L for 2007 through 2010. Application details vary across sources, so confirm your exact year and engine with the manufacturer before ordering.
Yes. The manufacturer states that its drop-in K&N filters are pre-oiled and ready to install, so no oiling is needed before the first installation.
The manufacturer describes the 33-2343 as a washable, reusable high-flow filter, designed to be cleaned and serviced rather than thrown away.
This is a drop-in swap rather than a modification, so the work centers on opening the factory airbox, removing the stock element, and wiping out the housing. Per the manufacturer's general helpful hints, some K&N filters are meant to seat into the airbox lid first, so hold the filter in place with your fingers while you refit the lid to keep it from falling out. Make sure the filter sits in the lid's groove and the lid sits squarely on the base before fastening anything. If the clips or screws will not close without excessive force, stop and recheck the fit, since the manufacturer warns that a misaligned install can break the airbox.
