just installed the hi flow cats and wut i notice is theres a extra 02 sensor wire on the right side...im just wondering wut to do with it???shoud i cut it or leave it as it is???and is the wire important at all??any help would b appriciated..thanks!

 

There should be two O2 sensors. One O2 sensor goes on the left cat and the other, you guessed it, on the right cat.