A lot of confusion over the R/Ts... When the R/T came out it got a better cam, in 2000 all 5.9s got the same cam, I have measured a bunch of them and have found that 100% accurate so both the people who say the R/T got the same cam and people who say they got different cams are correct. 318 heads seem to hold up a lot better than 5.9 heads, could be better QC at the factory they were made in or it could be that the 5.9 got death flashes that allowed the burning exhaust to burn the seats and valves or the lower compression doing the same thing. 92 and 93 magnums had the best ex. manifolds. Somewhere in the early 2000s they all got a much better Y pipe.