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LOL, As Bob points out what it does. For a little more tech it takes the exhaust from the drivers side bank and transfers it to the passenger manifold where it commingle with that banks exhaust then out the tail pipe. Ford left little room for a rear exit manifold on the drivers side due to the clutch Z bar and steering box.
Speedway make a real nice set of rams horns to eliminate the crossover and let it breathe. Hedders also do the trick.