Hi guys,<br><br>I have an 89 1.6i CRX SI DOHC, it was imported from Japan, I live in the UK.<br><br>I have just dropped the standard exhaust system out and in doing so have replaced it with a Janspeed system. The Standard system had a CAT, the new system does not it goes straight through from the downpipe. Unfortunately now my LAMDA sensor is reading that I have a CAT problem. I believe the LAMBDA sensor checks exhaust emission to see if they are running too lean or too rich, I believe it then changes the ECU to run the engine most efficiently. Basically without this sensor plugged in my engine will not last long (or so I have heard).<br>I believe there are a few ways round this.<br><br>1. Just have the back box and silencer of the performance system and keep the cat in - rather not do this.<br><br>2. Drill the LAMBDA sensor in to the new system as there is currently no provision for it, and hope that without the CAT in it will still work OK.<br><br>3. Stick a screwdriver through the current CAT.<br><br>If anyone has any experience/ideas on these solutions or getting round this problem I would love to hear them.<br><br>Cheers.