This question is actually for my 99' Continental, but since more here are probably changing exhausts on their Marks, figured it was better suited on this side and our engines are similar enough.
Installed Eastern Catalytic Y pipe https://www.rockauto.com/en/moreinfo.php?pk=1317925&cc=1356139&jsn=409 after the factory cats failed due a PO issue being neglectful (everything fixed, but it had a P0420, 1 cat was in chunks, a couple ignition coils were faulty along with minor rodent chew damage on the coil harness which probably caused the coil failures).
I followed the proper break-in i.e. idle 5 minutes, 2500 rpm 2 minutes to set the matting. And it probably has close to 500+ miles on it. No CEL and it appears to be doing what it supposed to. However, finally got on it a few times, and it smelled like..... well like when you eat something that throws your gut bacteria for a dive and your SBD gas smells like a sewer drain pipe for a few hours.
So more in-line with a sulfur-like smell. Pretty potent to be honest and it rolls back into the car. Car apparently came factory with the 2 up-cats like in the linked image, then AFTER the down O2's had a giant 3rd cat. Car was purchased w/o the 3rd cat (didn't realize until later as I thought the flex section it has in it's place was a factory thing).
So, would the 3rd cat scrub some of that stink out? Or do these aftermarket cats need more break-in time?
Worse case, it'll be a great deterrent for tailgaters
Installed Eastern Catalytic Y pipe https://www.rockauto.com/en/moreinfo.php?pk=1317925&cc=1356139&jsn=409 after the factory cats failed due a PO issue being neglectful (everything fixed, but it had a P0420, 1 cat was in chunks, a couple ignition coils were faulty along with minor rodent chew damage on the coil harness which probably caused the coil failures).
I followed the proper break-in i.e. idle 5 minutes, 2500 rpm 2 minutes to set the matting. And it probably has close to 500+ miles on it. No CEL and it appears to be doing what it supposed to. However, finally got on it a few times, and it smelled like..... well like when you eat something that throws your gut bacteria for a dive and your SBD gas smells like a sewer drain pipe for a few hours.
So more in-line with a sulfur-like smell. Pretty potent to be honest and it rolls back into the car. Car apparently came factory with the 2 up-cats like in the linked image, then AFTER the down O2's had a giant 3rd cat. Car was purchased w/o the 3rd cat (didn't realize until later as I thought the flex section it has in it's place was a factory thing).
So, would the 3rd cat scrub some of that stink out? Or do these aftermarket cats need more break-in time?
Worse case, it'll be a great deterrent for tailgaters