the '99 Dakota R/T was a 360 which had bigger ports. I could easily do a motor swap but I want to keep it as stock as possible. That is the point of putting manifolds. The most radical thing I would probably do is put a cat-back exhaust.valiant67 said:The 1999 Dakota R/T I owned before (the one that got crunched) had headers, really nice Gibson headers the previous owner spent a lot of money on. When the headers required removal for the front end suspension rebuild I did on the truck, I put stock manifolds back on it and noticed no change in performance or MPGs.
The manifolds (and the heads) were the same between the 318 and 360 Magnums. Even the R/T motor was just a standard 5.9L Magnum motor with a little better exhaust after the manifolds.the '99 Dakota R/T was a 360 which had bigger ports.