My +4 passed with a K&N filter but it might be a lot of crud on the filter. It is low down on the car & my experience is straw etc builds up. You need to remove the plate on the underside of the wing behind the UK drivers side front wheel to clean it. In the photo of the car at Malvern you can see where the filter sits. Not ideal to my mind. the air come in via those triangular opening in the inner wing sucking in spray etc from the front wheel.

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JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"