if mass air is so great then why.........

[jwboner]

The aftermarket systems like DFI use if/then situations. Like "if there is this much load on engine then it tells the injectors to perform a predetermined task. That's really oversimplifing. The factory systems can be reprogrammed with chips, but cannot be changed or tuned on-the-fly. DFI is supposed to only use the o2 sensor while tuning it(closed loop) and when done you are supposed to use the if/then tables, which are very detailed and quite hard to fine tune on your own unless you are an automotive engineer.

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347 DFI injected, TFS heads, T5, 4.11 9", tc subframe conns, torq thrust D's
A little history lesson using today's tech.