I installed nismo 555 injectors a long time ago and bought a used ecu. I believe I bought it from a member on here andever since then I am getting terrible gas mileage and driving the car the same way. I expected a drop in it because of the larger injectors. I am now wondering if I have a stock ecu trying to run 555 injectors because my Z is running extreamly rich. My ecu also has no sticker on it like I see all other of ash's ecus do. How do I find out if it is or not the right one? Thanks James