This is a long-tube exhaust header for carbureted Fiat 124 Spider and Coupe version cars. The components here are tailored for vehicles up to 1978 but can be used on later cars as well.
Header is mild steel, 4 into 2.
1 3/4" collector / outlet.
The 2-1 downpipe is mild steel, with non-catalytic converter shape (i.e. no dog-leg to passenger side to allow fitment of a converter) as was possible on cars up to 1978.
New and unused.