the general perception of vitz catalytic converter it to break/remove it. my previous 2005 vitz didn't have one, i had engine vibration problem, varied throttle to acceleration response etc but the sound was taken care of with an extra dholkiee. the new one i just imported (2008) has its catalytic converter and don't feel the need to remove/clean it yet, but in time i will.
my question from experts is that there're two o2 sensors in vitz one before the catalytic converter, the visible one and one after the catalytic converter. in essence assuming the catalytic converter is installed both of the sensors will get different readings but if it is removed they essentially will be getting the same reading. so why do people still insist on removing it?