First, for those less mechanically inclined, or unsure about what is what in their car (which the filters can be confusing) -- this is the cabin filter that is installed in the Frunk area of your car (sometimes oddly called the Engine Air Filter); this is not the cabin filter that is mounted near the console inside the cabin of the car. Ultimately, a Model Y needs both.The nice thing about the outer filter is that it is much easier to replace than the inside cabin filter. Pop off the upper covering, unscrew some screws, pull the old filter out and put the new ones in. What may slow down the less mechanical folks is not having the right screwdriver on hand. Unlike most inside cabin filters, this does not include a screwdriver of any sort. Personally, I'm good with that; I throw away too many already. But you may want to pop off that snap-on cover first to make sure you have the right tool.Fit is good. All four parts go in snuggly, and there is no binding or bulging when you're putting the parts back together.Once in, I notice no extra effort from the AC system (something you'll get if it's starving for air), and lacking a scientific study, the air seems properly filtered with no noticeable odors. These seem like a good alternative to the OEM filters.