Postby RBphoto » November 16th, 2007, 11:30 am
I think you should look at the root cause of the crack, probably leaning out? using Super unleaded gas? O2 or MAF or timing problem?
From my experience (or rather my father's), once one part off the exhaust fail, it will do you well to change the whole thing, from engine come back. On two separtae vehicles, I have noticed that once one part of the exhaust has gone, all the other parts start to go, one month is the piping, one month is the muffler have to patch, next month is a gasket leak.
Now, I would guess that the whole bloody thing was built to have the same service life of the whole system, so once one part goes, it is an indication that the other parts on the way. This is just my observation of my father's cortinaL 1.6 and Mazda 616, and his conclusion as he had the same problem with both (after about 12 years of ownership of each.