Header's that fit 1973 dusters

TTI are the best fitting headers. Engine bays are the same, won't require a 90* adapter, no need to remove any steering components or links between tubes (just might need to lift the engine a bit). Their 1 5/8"-1 3/4' step headers work great on my low-mid 11 second Dart Sport. The small exit tubes keep bottom end while the larger step helps up top.

Exhaust on a Mopar 300hp Crate Engine - Tech Articles - Mopar Muscle Magazine