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Sorry for late replay, regarding your question about the collar.


Its difficult to guess whether that missing piece could be the culprit.
Because usually those connectors on the hoses are very firmly and tightly attached to the airbox. So i don't believe that a missing collar and therefore a bit of play on the hoses (not on the connectors) themselves would cause a leak.

Usually those clamps only function is to keep hoses/pipes from dangling about and to keep them grouped together, so they don't get struck by moving parts.


Did you check if the plastic connector is ok? And if you connect the hoses to the airbox and you wiggle a bit on the hose, if its still firmly attached?

If you attach the hoses they make a firm "click" noise.