Sorry its a 2003 4.6is
BMW AIR FILTER INDUCTION KIT E36 E38 E39 E46 E60 M M5 on eBay (end time 13-May-10 21:04:50 BST)
this was the main filter I paid £38 its got a 92mm inlet
As for the small filter its a 28mm inlet 90degree bend filter for a scooter, needs a 90 degree bend otherwise it wont fit onto the inlet on the secondary air pump.
Scooter Air Filter Blue Covered K&N Style 90 Deg (NEW) on eBay (end time 27-May-10 20:15:32 BST)
this aint the 1 I bought but you get the idea this is the seller I bought mine off though.
I'll get some more pics and try to do a how to but its 1 10mm bolt and disconnect 3 hoses, no tools required they all pull off. There is a small vacuum hose that opens the inlet valve in the airbox which becomes redundant.
Pics to follow soon.