We just need to convince them that they are being dubbed as the perfect turbo for the 1.8t in america and it wont be long untill they pick up over here and they want to be ahead of the game lol
 
Did a bit of looking around after you mentioning these larger MAF's and i found
S4 MAF - 3.25" o/d and 3" i/d
RS4 MAF (old 2.7TT not the V8) - 3.5" o/d and 3.25" i/d
May just want to clarify this first though
 
I was thinking about doing the same.. still need to model one up so I can get the old man to cnc it for me..
I would say id make you one too but I dont think ill have them done in time for you.

Bill sells them though I think, or im sure sammy will knock you one up