I just paid 2100 bucks to reinstall a cat. My 05 was purchased in MO at one year old and with a straight pipe. Sounded great at first but soon got irritating as heck. We added the muffler back but not the cat. In 2013 we moved to CA. To license the truck I was required to install a new cat. Not a cat but a new one. CA. would not accept a used one. Big problem. For the 05 Cummins I was told by the dealer that there were five new cats in the country. Dodge had to get involved to ship a cat from Ohio to CA. So if you decide to streighten out the exhaust hang on to the parts. You may need them some day. BTW. With streight pipe we got 21 - 22 mpg on the highway running 2000 rpm. With the cat and muffler I get 20 - 21.
