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.
2014 F25 X3 M-Sport Carbon Black, Technology/Premium/Winter/Driver Assistance
2011 e92 335is DCT - Cobb, ETS IC, AFE DCI, BMW PS kit, M3 control arms, various cosmetic improvements RETIRED!
2007 X3 RETIRED!
2006 e90 330i 132k miles RETIRED!