the runner is the rubber tube that is fixed to the original air filter which takes the air to the carbs, you can take it off (kinda like the snorkel) and you use that to extend the K&N filter away from the carb. in my case i needed it cos the filter was rubbing on a metal stub of the bike frame, but i think if you use the 0990 type filter it doesn't have that problem, and you can fix the filter directly to the carbs.
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Kawasaki Z250, Bored up to 300cc with 12.8 CR, 41hp at wheel 27nm torque, Two bros full exhaust with DB killer
Dynojet Power Commander V, KnN Open filter, intake and exhaust ported, Puig Windshield
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