The BMC's for the A4 1.8T's DO NOT fit out of the box... very annoying! (Unless the FWD cars have a different MAF housing anyway... Quattro one doesn't fit).
Everyone I know who has one has had to make an adaptor of some kind to get it to fit properly... the major problem with them, aside from difficult fitment (not impossible, just difficult) is that the MAF housing will not screw directly to the BMC case because there is no clearance between the edge of the MAF and the flush surface of the BMC... it needs to have a raised mounting surface... which, incidentally, they do have in their range of filters! /ubbthreads/images/graemlins/confused.gif
How they have not thought of or resolved that issue before marketing something they sell for £200 is totally beyond me and utterly ridiculous in my opinion...
Also, the oblong-shaped thing that was referred to is the ignition amplifier... it is necessary to keep this cool since if it overheats and burns out, a new one is not cheap!
T