EFIE or MAF/MAP?
Hello. I am thinking about installing HHO system in my car. From what I have read I guess I need to install EFIE or MAF/MAP sensor in my car in order to maximize fuel savings. So my question is - what should I install (EFIE or MAF/MAP sensor)? My car is Audi A6 (c6) 2005 2.0 TDI. Thank you