Around 5 - 6 months ago I purchased a PiperX panel filter for my 172. Today I figured Id get it out and give it a clean, so I popped to Halfords and spent £10 on the cleaning kit.
I removed the filter only to find all the rubber around the edge had perished and fallen away not giving a good seal around the top of the airbox.
For now Ive dropped the standard one back in and will be sourcing a replacement in the new year, most likely a green one.
Just thought Id mention that.
Lee