Sorry, I have been really busy and havent had much time to get on the net.
The AEM EMS is a replacement ECU that allows you to change anything and everything that you want. You can switch from using a MAF to measure the air entering your motor to a formula that uses manifold pressure, manifold temp, and speed of your motor to determine how much air is entering your motor.
Its completely configurable for any MAF, MAP, injector, ignition, TPS, KS, etc.
AEM will be releasing the plug and play version of the EMS for the S13 240s in about three weeks. Basically you will unplug your factory ECU and plug the AEM EMS right into your wire harness. You can then use a lap top to change, program, datalog, etc. This system isnt for average 240 or average enthusiest. It MUST be programed to operate your car correctly and safely.
Please go to
http://www.aempower.com and read up a bit. Its an awesome system that will allow you to do whatever you want to your 240 and never have to buy another chip, send the ECU out, etc. Its cabable of doing what ever you want.