My roomate owns a 97 Honda Prelude SH. He recently replaced the cat for a test pipe. IIRC, Before installing the test pipe the car would throw an ecu code for "Catalytic Converter Below Threshold". After installing the test pipe the same ecu code still appears. Can you recommend a particular type of O2 simulator that will keep this code from appearing? The simulator will replace the secondary 02 sensor for reference. I've seen single and dual outputs simulators thus far. Any advice on brand and type is appreciated, TIA.