Just purchased this Mini Monday and i decided i would take a look at the various engine components. Air filter was so gunked and dirty and coil pack on cylinder 3 and 4 are corroded. Luckily just ordered parts form WMW
Air Filter at 59,700:

 

You should have seen mine, I think it was literally never changed. When I pulled it out about 1inch thick of material fell out. Mostly leaves and sticks.

 

as a temporary fix i bought a stp paper filter for 10$ until my ddm comes in. what a difference. i can actually hear my supercharger now