Great thread, I did mine last night using black filters and it looks great, and with only $60 spent!!!
I would add 2" PVC pipe has to be cut to 2 inches for the front intake tube, and 5 inches for the back pipe. I played around a bit with different lengths and these seem to have worked best. Clean those inside and out to ensure no shavings are left in. Will post pics later.
2016 F80 M3 BSM with Black interior DCT/Driver Assistance/Executive/LEDs/Adaptive/Black Wheels
2014 F32 435i xDrive AW/CR
2014 F25 X3 M-Sport Carbon Black
2011 e92 335is 2007 X3 122k miles 2006 e90 330i 132k miles