People out in Kalifornia have (from what I've heard) passed emissions just fine without the precats. IIRC I've even heard people passing without ANY cats, but the car must be warmed up first. I'm not sure how true the latter one is. I plan on only running the main cat when the time comes.....
Originally posted by whitegt:
So if you leave the main cat on you can still pass emissions? I have always heard that the headers will make you fail emissions. Shed some light. 
