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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Hammer is right. This isnt the 1970's anymore and todays cats are 99% efficient. If you suspect that its plugged then by all means replace it, shouldnt have to if the things only 3 years old though.
I had an 05 wrangler with the I6 motor in it, and right after i bought it, I put a CAT back magnaflow exhaust on it. In the winter of 07, i was going to do a little wheelin in the powder, and i couldnt make it up the paved grades. Lost almost all power. For a week before that, i kept hearing my exhaust rattle when it was cold.
Come to find out, the CAT had failed, and fallen apart blocking my exhaust.