New to the forum and had a question that no one that I know can answer. I have a '03 2500 ram with the hemi and it only has one cat. My friend has same truck but a '04 and has the two cats. Was woundering why this was? If you know please share.

 

2003 hemi, that was the design of the exhaust system. For 04 and up they redesigned some stuff. That's just the way it is.