I have two ECUs made for the JDM S15 SR20DET with the manual transmission. Both of these ran perfectly on my motor a few years ago. I had a spare ECU incase if shit happens, then eventually upgraded injectors and forced to run a stand alone. They have been sitting in a sealed bag in a temperature controlled environment for the past 2 years.
The difference between the NQ and QT ECU is because of a slight tuning to the fuel map throughout the production years. One came from a 99' S15, while the other came from 00-02. Not a clue which is better, they both ran the motor the same to me. More info here:
http://zilvia.net/f/engine-tech/6260...ml#post3152535
I would like $200 shipped for each.