My understanding of this from the Mustang 5.0 world is that if you increase your injector size, you can use an aftermarket MAF specifically designed to "fool" the PCM into working with the larger injectors.
Alternatively, you can leave the MAF alone and use the EEC-tuner or something similar to edit the tables in the PCM relating to injector size. (This is by far the better way of doing it, assuming that the stock MAF flows well enough).
The MAF by itself has little to do with injector size--so long as it can handle the flow rates required by the engine it's attached to without maxing out. The injector size is determined by the PCM programming.
As a point of reference, the MAF used by the 89-93 Mustang 5.0 was also used in a number of different applications, including the 3.8L V6.
So, to recap:
1)In aftermarket applications, the MAF does determine the injector size, but only when you want to fool the PCM and are using larger-than-stock injectors.
2)In stock applications, the MAF has nothing to do with injector size, it is handled by programming in the PCM.
3)It is possible to reprogram the PCM with eec-tuner or similar devices for larger injectors without changing the stock MAF, assuming that it is adequate OR I think if it is not you can buy a larger MAF that has the same curve (??) as the stock one.
Brian
