I bought a 2001 dodge ram 5.2 4x4 from California not realizing they have a stricter emissions code they follow. I have two smaller cats one on each side of the manifolds. Then it comes down crosses over goes through another cat then out through the muffler. I have heard some people say that this is an easy set up for true duals. Is this true and what are the benefits of true duals.

 

Louder (depending on what muffler you go with) and a few more HP.