Getting ready for MSVA, I took car to a friends farm to give it a good run. All was well but after a good few runs I noticed that the o/s exhaust note sounded more “popping” than the n/s. Previously they always sounded the same. This morning I took the bonnet off and can see that the o/s K & N air filter is now a white/beige colour and the n/s filter is still the original purple. Looking on Google suggests they change colour if they get wet but that has not happened. Also, I am fairly sure that colour (and exhaust note) have only changed as a result of the longer running yesterday. The car still starts ok and sounds fine.
Has anyone got any thoughts on what could cause changes?
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