I notice in the TSB that the replacement cats have a different part number than the original factory installed cats. Beacause this has been a recurring problem for several years, I wonder why Toyota never discontinued using the original exhaust parts and switched over to the other "non-smelly" parts during assembly.
What would be the reason for not trying to eliminate the problem on the newer vehicles from the start? Cost? Could the original cats be "better" in some other ways? You would think that any cost difference could be made up by Toyota not having to pay for these replacements under warranty.
I opened my rear window only once so far while driving, and I immediately noticed the strong sulfur smell. Once the nice weather hits, I wonder if I'll be looking to have this service done on my rig too.