My mechanic thinks that the catalytic converter may be the culprit for my high rpm power loss.

He told me to go back to Ford as there is an 8 year/80,000 mile warranty on the catalytic converter.

Has anyone ever heard of this warranty? I've never heard of this and only knew of the 3 year/36,000 mile bumper to bumper warranty.

I hope this warranty exists as my truck is almost 8 years old and has 76,000 miles.