The thin metal sleeves in the bushings also deform over time

Multi-row reinforced stitching for durability

and enlarge two holes in the back of the plastic housing to install the kit

For technical data see: https://motoz

K&N - High-Flow OEM Air Filter (KA-4018) Options:KA-4018 The thin metal sleeves inDesigned to provide increased performance Pleated media provides a large filtration area offering long service intervals Multi Layers of woven cotton gauze media offers excellent filtration Fits directly into OEM Airbox with application specific Sealing Bead to ensure a precise fit Fuel Management modifications are not normally required for increased performance Washable & reusable, pre oiled and ready to ride!