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I'm guessing online calculators err on the conservative side when computing injector sizing (i.e. Lambda 0.82-0.85, low BSFC, 20% headroom ...) The reality is an AFR of around 12.5 is a bit too rich for a Porsche motor and 10% injector headroom is all that's really needed.
Combine that with the fact that the 993 injectors at 235cc/min @3.0 bar actually flow about 266cc/min at the 3.8 bar fuel pressure the 964 and 993 run at, and they are more than sufficient for a heavily modified 3.8 and likely a 4.0.
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