I own a 960 and am about to put my 4th catalytic converter on it. When the orginal pipe went and the cat had to be replaced with it, Volvo said to use a muffler dealer. They said it would be cheaper for us. We did just that but within a few months that cat had broken up. We were forced to get a new one. Well....within a few months that one went also. The next one lasted only a few weeks. In between these, the car passed inspection and was taken to the dealer several times to assure that the engine was working properly, which they insisted it was. Now we have a situation where the manufacturer of the cat says, "not my problem, your car has a problem" and the dealer says, "car is fine cats must be defective". HELP! Our prepair bills to date are in excess of $10,000 and about to climb higher. Does anyone have any suggestions. Any help would be greatly appreciated.