Thanks for the advice,I went yesterday to my local shop,and they installed 2 carefully bent pipes from the front all the way to the resonator,nicely done,for next to nothing because they get about 150$ out of the used converters...anyway,one of the front ones was melted.I had both O2 sensors removed and there is no check engine light on dash,it was on before the job.The computer is not triggering the check engine with the missing converters,how about that?...and the power is amazing,the S420 is flying down the road.