I have a 71 cutlass supreme, the car has factory dual exhaust pipes, if the car came with a 350 2bbl carb could it have dual exhaust or did only the 4bbl cars come with dual exhaust?

 

Per the page from the SPECS manual below, in the 1971 model year, RPO N10 dual exhaust was N.A. with L65, the 2bbl 350. Ironically, in the 1972 model year, you COULD order RPO N10 with the 350 2bbl motor. Go figure.