I ran a Green filter and then K&N in one car. No difference between the 2. Pretty much same build and filter medium. Been using K&N for a long time for my other 2 cars and no complaints. Just bought K&N for F80 last night.
BMC is oiled also and the PIA with all these filters is the cleaning and oiling process. You have to be patient and repeat the steps a few times to get it right.
Looks like BMC is made in Italy, so there's that.