Five stars mostly for making life easy. Instructions for swapping the filter are easily found online and this product was simply swapped in with unlatching 3 spring loaded fasteners. Very easy. Only suggestion is to note the direction of the old one so you do not end up wondering which side is top or bottom. Nice construction and may very well have been the exact same product installed by my independent mechanic at a substantially greater cost. No complaints. More than adequate replacement cabin filter.

I got my car (2000 323i) used and was not sure if the air cabin filter had ever been changed - it certainly did not smell like it. After removing* the old one I could see why the air smelled so moldy! This Mann filter fits PERFECTLY and in a few minutes everything was smelling cleaner. Huge and very pleasant difference - seems the activated charcoal really does work. For the money, this can't be beat.

* Note - this is about as easy a car job as there is. Opening a can of tuna is probably harder, really. There are a few good Youtube vids on how to change this on an E46 if you're not sure. No tools required as it involves just twisting open three clips that hold the top cover in place. Everything is easily accessible and it takes about 2 minutes to do. Just keep an eye out for which way you place the filter and that's it. I can only imagine how much money they might charge for doing this at a mechanic shop/dealer. And it really takes no more than 2-3 minutes to do.

Try this brand in your cabin air filter slot and I think you'll see they are great at filtering particles (pollen/ diesel, etc) and many odors from the outside air entering your auto's passenger compartment. Change your cabin air filter REGULARLY. You'll notice the difference!