hi all , had my 4x4 saff set up 2 yrs ago by paul hills at engine advantages, had no problems touch wood. but at mot time my co is allways at 7% he did away with my lambda and used pectal for a more refined set up he said. he told me to wind down the ecu screw wich did bring it down and therefore passed , told to wind it back up again as cossies like to run rich. i asked if the screw would alter the fueling he said no the screw is just for emmissions and has nothing to do with the map, is this a common thing to do at mot time with tuned cossies without closed loop , its a stage 3 by the way. dont know what software he uses neither bayjoo, msd, ? thanks all.