I actually checked my spare air filter, and in my opinion, it seems to be made very well.
it is generally said that that you do not need to change the ECU map in the bike or put a fuel enricher if you change only one thing: open exhaust or open air filter. if you change both, you need to get some aftermarket system to compensate for too much air entering your system. Keep in mind, that the stock map is already too lean, to meet the emission control. people often think that because of their bike sounding louder, it has become stronger. In fact, it has become weaker. If you really think that your bike is stronger by putting more free-flow air filter, go and check the top speed. In most likelihood, you will lose the top speed. The bmw has a wideband oxygen sensor, so it might be able to compensate more, but I wonder how much.
as you love riding, you need to love you bike