2001 5.2 130,000 miles. Does the Cat need to be replaced with 130,000 miles. What would be a good replacement for gas mileage. IF Cat is removed and test pipe install will that help with mileage without throwing codes, back fires, and without being loud until new Cat is installed

 

I assume you are referring to a Ram; you my friend are in the wrong place as this is the Magnum wagon section.

 

Closed duplicate thread.