I read this out of SCC (suck,squish,bang,blow series) They are basically comparing a MAP sensor (which are cars have) vs. a MAF sensor (nissan, toyota, mitsubishi) saying that a mass air flow sensor is a lot more mod friendly. Here is what it says " A few popular imports use what is called a speed density system. Honda and Acura are the main examples. These cars use a MAP or manifold air pressure sensor to help the ECU determine how much fuel to inject for a correct mixture. Unfortuately, since they must calculate airflow based only on manifold pressure and rpm, the calculation must be based on the pumping efficiency of the stock engine. If you improve the pumping efficiency of the engine, most speed density systems do not compensate for modifications very well.
All is not lost, however. Add a device called a fuel pressure riser. This is an adjustable pressure regulator that goes in the return line to the gas tank from the injectors. With a fuel pressure riser, the fuel pressure to the injectors can be controlled, a process allowing an increase in the pressure to add more fuel to make up for the additional air being drawn into the engine."

Does anyone have a fuel pressure riser? Would it really help on a car with just I/H/E?

 

First of all, take what you read in SCC with a grain of salt.

Second, Fuel Pressure Riser = adjustable fuel pressure regulator.
Its a good thing to have along with some sort of AFC/SFC to modify
the fuel delivery.