No cat
#2
RE: No cat
You need to find out what the complaint is and take it from there. You will have to install downstream O2 sims or have the PCM tuned to delete them. Otherwise the fuel mapsmay not be correct.
#4
RE: No cat
The folks at http://speedinc.com suggest taking out the cats and they delete the relevant parameters in the computer, so no O2 simulators are needed...