Do you have a camera phone maybe?
I can see no reason why you'd have the MAF disconnected, with that filter, but you need it in place.
The only reason I can think that you may not have both fitted, is that you may need some silicone hosing to be able to join the case of the BMC, with the case of the MAF. (ie a joiner) As at the mo, both connections on the MAF and th BMC will be plastic so wont fit together?
Am i right?
If so, you need to measure the diameter of the BMC connection, and the same for the MAF, and then have a look at the forge website.