The K&N E-0940 is a round, tapered replacement element that drops into the factory airbox in place of the stock paper filter. The manufacturer describes it as a reusable, washable high-flow filter engineered to last for the entire lifespan of your vehicle. Its oiled cotton gauze media is the core of the platform, which is why it appeals to buyers who want a 1994-97 SN95 Mustang intake upgrade without modifying the stock box.
The purchase case is mainly reusability. Replacing a paper filter every few thousand miles adds up, and a washable element avoids that recurring cost. The manufacturer's markings call for a No-Hassle Lifetime Limited warranty, though its SVT Cobra page cites a Million Mile warranty, so confirm current terms before buying. Set expectations on power: the manufacturer markets K&N filters for added horsepower, but no gain is confirmed for this part. A dyno test on a 2011 5.0 showed a slight loss compared to the factory filter, according to user forums. Buy this one for reuse and a modest intake upgrade, not a large power gain.
The manufacturer's E-0940 page lists the 3.8L V6 for 1994-2004, while its SVT Cobra page lists the filter for the 1994-1995 5.0L V8. Details vary between pages, so confirm your exact year and engine with the manufacturer before ordering.
The manufacturer describes the E-0940 as washable and reusable. Any degreaser will work, according to owners on user forums, but follow the manufacturer's care directions for re-oiling.
Results vary. Owners on user forums have reported little difference in seat-of-the-pants feel, and a dyno comparison on a later 5.0 showed a marginal loss versus the factory filter. No horsepower figure for this part is confirmed by the manufacturer.
This is a drop-in swap rather than an intake modification, so most owners can handle it with basic hand tools. Release the clips on the airbox lid, lift the lid, and remove the stock paper element. Seat the K&N with its rubber top sealing evenly, then close the box. K&N's install sheets for other drop-in applications stress that the filter must seal properly and that orientation markings matter, so check both before closing the lid. Wash and re-oil the filter according to the manufacturer's instructions before its first use, and use a clean cloth on the airbox base to remove debris before installing.
