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The only reason to change is seeing 5.2 volts on the multimeter you have on your MAF signal.
Most of the factory MAFs have a nominal air flow figure which they will top at. The for example Z32 is about 500hp worth.
This is all about the metering range. It has nothing to do with the size of the pipe. :-)
The JDM is full of tuners replacing MAFs with Z32s or R32s. The airflow improvement is only at the very top end. The extended metering range is the usual reason.
Hitting the fuel/airflow cut is not fun and depends on the fuelling and ECU spec of a given model. Your 240 models may have a better ceiling than some others.
My ca18 hits fuel/airflow cut at 9psi. Stock turbo with only minor efficiency improvements.
The Z32 AFM, PUMP, and large injectors are all necessary at this point. The factory cleverly specs all these levels to work out similarly. Once you max out one you are protected by the ECU from going too far wrong.
To change is a matter of altering the ECU parameters for the MAF and to suit the spec of the engine.
JWT as well as many others can do this job for you.
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