I'm not the original owner, I don't know if the warranty would apply? plus I don't have the stock air box on anymore,and the resonator is removed. That is probaly grounds to void it!

But when I drove the car again this afternoon(after I reset the ECU) I didn't smell sulfer anymore. And I work both my jobs tomorrow so I'm pretty screwed for time. I have about a 2 hour gap. Maybe I'll try to squeeze a good ride in there. I would think it would be more noticable after a long time, then a short little trip like I made.
it could also be the third one! haha but there isn't a sensor for that. Stupid 3 cats on one darn car. Ford IMO should have just made one super efficient cat instead of putting 3 in...