With the Dodge Ram trucks, if your truck has less than 100,000 miles an 7 years old or less it should be covered under the factory emission warrenty. My 09 Ram Hemi was covered, my 16 Ram was a diesel no problems, and my 22 Ram Hemi only has 8000 miles on it. My 12 Challenger Hemi I put long tube headers on it in 2014 no problems yet.