Is this important? It is been disconnced from my cat for quite some time. Please advise guys...

~Ryan:confused:

mines broke a long time ago also but it seems to be running fine. i dont think it is really nessecary because the cat is connected to the header which is connected to the block but maybe it'll be best to re-ground it.

Well I have no cat therefore I have no ground and my car ran fine for like a year, before I blew it.