im installing my new hotshot header this week and ive read that the o2 is grounded to the cat. is this true on 91 ser. when i was taking my old stock manifold off i noticed the metal end of a electrical connector on the bolt on the front of the cat. it wasnt connected to anything there was no wire. the bolts on my cat would not come off no matter what so i cut them off and drilled them out and installed new nuts and bolts. when i cut them off i cut up the connector that was on there but it didn t look like it was connected i dont have a fsm yet so i was just wondering if anyone knew.

On the front drivers side of the cat there should be a short ground wire. It's only 3 or 4 inches long and connects to the chassis. Hope this helps:)