To all who are interested this is my personal ECU that I had in my audi s4 it is fully functional and have all documented paperwork regarding the tuned ECU it makes a major difference on the car with immediate results. I would only let you buy it only if you try it out first. I went from stock settings an jumped around 315 hp/350 lbs torque easy. This is def. your best investment for your audi S4 if you want to get the full potential of your car. Im asking $349 Contact me no prob if you have any questions 908-494-2000 Niko

 

I am deffinately interested but who tuned the ECU. And is it tuned for 93 octane?