Mine failed under the warranty twice. I figured why give them another chance and went to headers. I would think the price would be similar and you'd never fear clogging them up again. Of course if you aren't over the 80000miles I think they still have to warranty the parts regardless of wether it has been done before or not. Now I don't know if California is a state thet does the emmisions test with the vehicle warmed up, but if it is there are many documented cases of vehicles passing emissions with headers.
