Dutra,s Duals/slant 6

Why do you want them? If you are keeping the slant in your Dart,you should keep headers on it.Dutra Duals are cast iron manifolds just like a stock manifold. All it does is split the exhaust.Its still a cast iron manifold with the same sharp bends and port size as stock.I have not seen proof showing any improvement over a stock manifold,other than the improvement from going to a bigger size pipe.But you get that with the stock manifold as well. Not worth the 400+ if you ask me.