Have Read a lot of great information about fuel management systems on this site. I initially intended to get the ECM flashed for Stage I but after reading posts will now go with the TFI. Looks like it runs about $100 more but will be more flexible with add-ons. The install literature says to unplug the O2 sensors but does not mention installing anything in the connectors. Do you have to install any jumpers and does this cause any error codes to be reported?