I have seen post with po420 and then others with po430. My question, I have both! Oh, and 172XXX on the clock. I am guessing that I have either burnt up the cats on the german autobahn or the down stream O2 sensors. I am comtemplating just hollowing out the cats, and putting simulators on? Good or bad idea, I can do it all at the on base shop and only have to pay like twelve dollars for a lift.