Originally Posted by shiv@vishnu

The PROcede's o2 simm feature should be compatible with all ECU versions. Past and future. And even if we run into an unforeseen hiccup with future software, we have enough flexibility to adapt to it. I've been running full catless for the last 10k miles with no codes. This has been tested on the original software (my car was among the first 335s produced!) as well as the newest software version (as of 2 weeks ago). Without the o2 sensor sim, my catless car would throw codes (and go limp) within 10 miles of driving. So yes, problem solved

shiv