so , in relation to the lambda probing in short term fuel trim on any mentioned car , if the manufacturer has decided to use the lambda probe(as they have to) , then the management system can alter its fueling to suit via the voltages recieved from the probe , now lets add more variables , i.e two more lambda probes into the equation, one extra before and then one after the cat, and then create a referance betweeen the values that all the data has to be in a given value for eobd II (cause all these cars weve mapped over the last 5 pages need to be clean these days especially the ones that are compliant for eobd II ) so we then have to look at long term fuel trim , and multiple cylinder adjustment, also , calculated load values of an engine in any given instance , as new systems are clever and so many requirements for 2005 legislation will be in effect , how many of us will be mapping our own cars when the MOT will be pulling us over and checking for operating MIL lamps , interrogating our ecm memory functions then whacking us for a big fine due to non compliancy ??

so with the extra monitoring function of multiple O2s and also the useage of three way catalysts with massive oxygen storage function , how is the performance upgrade going to be a DIY option for the likes of 95% of the PF user