This from another thread.
https://f87.bimmerpost.com/forums/sh...ghlight=leaves
Response #3 from MystroX5:
"This is a old problem I had with my C4S. It sat so low and sucked up everything in its front and Porsche didn’t think about this and made access a nightmare. Mods to solve this for performance cars are put a fine mesh screening behind the factory plastic screen. This has its own issues and not what I did I.
Here is what I did: I use a powerful Shopvac with a 2’ extended flexible hose that I taped on one of the Shopvac extension hoses. I bought the flexible hose at Lowe’s from the plumbing dept. Get a clear one. This system has worked for 10 years now and I suck out butts, leaves, trash, etc... and I only drive in nice weather away from the cities with the 911. I expect the M2C to be worse with its even larger air intakes.
This mod has gone viral and a lot of people use it. So much easier than taking your front end apart to do yearly cleaning."