I need to start somewhere, and you guys are well aware that changing too many parameters at once can lead to confusing during diagnosis. I recently went with K04's, with 3" dual cat-less downpipes, and SSAC catback, on my tiptronic 2001.5.  I picked up a set of 52lb EV14 injectors, and I'm thinking that a good test would be to tune solely for these injectors, getting them dialed in as well as possible.  I would like to dial in KRKTE, and TVUB on my setup with the factory 4bar FPR, to get the tune running like factory.  If I keep the MAF, and intake setup constant, is this all that needs to be adjusted?  Like I said I want to ease into the water, and see how my setup responds. Is that all I need to pay attention to for this simple change?  If I am wrong I apologize, I am trying to learn, but like I said this baby step seemed simple enough.  I am extremely knowledgable with engine tuning, just this german/load based tuning is definitely new (albeit very interesting to learn).  Thanks in advance.

Awesome, thank you very much.

I fully expect to monitor stft's( there is a way to diable ltfts by code but I do t know it yet) to perfectly tune these values. 

Why do folks increase the maf diameter other than the obvious restriction decrease?  Is it to I crease the effective mass flow range?  If so at what point does the stock 73mm maf become a restriction?  I am trying to see what steps I should take in my tuning experiments to go from step 1 to a final solid tune.  I have an extremely extensive background in engine tuning just very little in this ECU in particular which utilizes a completely different strategy than I am used to.

I want to tackle the injectors first and then focus on the MAF, since that would introduce too many variables.  Is there a general concensus on a good off the shelf maf housing solution?  I'm relatively new to the Audi world so I am not that familiar with the vendor options.  It seems that many go with an 85mm MAF, is there a particular reason for this size vs larger options?