Originally Posted by Troys
So say a fella has a 1995 and with a full NRP system. One of the cats goes bad. Rather than replacing them, the pipes are cut just behind the cats and the cats busted out and the pipe re-welded and bolted back up. New O2 sensors installed. What might be the potential harm if any?
Might fail emission test? Not sure if cats are mandatory, I assume they are, in which case a fine?