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It's probably due to the design of the FCD itself...
The older Racing Beat units were just resistors inline of the signal.
This basically shifted the overboost fuel-cut point to a higher boost level.
I think I was able to hit it *with* the older Racing Beat FCD at around 18 - 19psi.
Most of the new ones are voltage-clamp design, which just keeps the signal at a predetermined maximum *if* the input voltage exceeds that level.
Since the overboost fuel-cut boost level is different between the FC turbo series, this is why you see specific applications explicitly stated.
-Ted
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