Each of the four K&N Bolt on Units are available with blank bases. They come supplied with pillar kits but no gaskets
Note: Filter BHP capacities relate to power at the flywheel.
The base of the filter is blank and can be cut out to suit the application as required
Round 150mm

Small Oval 182mm x 120mm

Large Oval 228mm x 135mm

Rectangle 190mm 160mm

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K&N “56” Bolt on filters are designed to replace the air filter box assembly and are available for a variety of vehicles (see the A-Z listing page) to see if a K&N 56 Filter Kit is available for your vehicle. K&N “56” Bolt on filters give extra long service life over the original element. If a K&N “56” Bolt On filter is not available for an unusual application then perhaps a Blank Bolt On Unit may be the answer

K-N Automotive, Air filters, Replacement elements, Automotive Elements, Clamp on, bolt on, High Performance, washable, re-useable, K&N Long life Automotive Air Filters for auto, 4x4 off-road, racing vehicles, small engines, model cars, vans, trucks, and industrial use