stinky exhaust

[pancette]

After driving the car the exhaust smell like rotten eggs . I have changed the catylitic converter and oxy senser because the car failed aircare with high HC and CO . now the readings are very low with the new cat . But after a run at high speed it stinks when I stop at a traffic light.
I assume the stink is because the cat cannot keep up with the rich mixture .Car runs perfect otherwise. Are there any common places to troubleshoot on this thing?

[ibrokemymx5]

on my 91 when the voltage regulator went bad it was charging the battery at 18volts and boiling it I would start the car and check to see if its over charging the battery might be yer source of bad egg smell

[sunbrn]

Give the cat some time to break in. It should clear up.