An exhaust manifold for an internal combustion engine, the manifold comprising: at least one first exhaust gas inlet connectable to a first bank of cylinders of the engine; at least one second exhaust gas inlet connectable to a second bank of cylinders of the engine; first and second exhaust gas outlets (16,18) connectable to respective first and second volutes of a twin volute turbocharger; at least one wastegate outlet connectable to a bypass passage which bypasses the turbocharger; and a diverter valve located within the manifold, wherein the diverter valve is adapted to selectively direct exhaust gas from the first and second inlets (12,14) to at least one of the first and second exhaust gas outlets (16,18) and the wastegate outlet; wherein the diverter valve is adapted to selectively move between: (i) a first position in which the valve diverts all of the exhaust gas from each inlet (12,14) to the first exhaust gas outlet, and prevents gas flow through the at least one wastegate outlet; (ii) a second position in which the valve maintains separate flows of the exhaust gas from each inlet (12,14) to the first and second exhaust gas outlets (16,18), respectively, and prevents gas flow through the at least one wastegate outlet; and (iii) a third position in which the valve maintains the separate flows of the second position, and permits flow of exhaust gas through the at least one wastegate outlet. at least one first exhaust gas inlet connectable to a first bank of cylinders of the engine; at least one second exhaust gas inlet connectable to a second bank of cylinders of the engine; first and second exhaust gas outlets (16,18) connectable to respective first and second volutes of a twin volute turbocharger; at least one wastegate outlet connectable to a bypass passage which bypasses the turbocharger; and a diverter valve located within the manifold, wherein the diverter valve is adapted to selectively direct exhaust gas from the first and second inlets (12,14) to at least one of the first and second exhaust gas outlets (16,18) and the wastegate outlet; wherein the diverter valve is adapted to selectively move between: (i) a first position in which the valve diverts all of the exhaust gas from each inlet (12,14) to the first exhaust gas outlet, and prevents gas flow through the at least one wastegate outlet; (ii) a second position in which the valve maintains separate flows of the exhaust gas from each inlet (12,14) to the first and second exhaust gas outlets (16,18), respectively, and prevents gas flow through the at least one wastegate outlet; and (iii) a third position in which the valve maintains the separate flows of the second position, and permits flow of exhaust gas through the at least one wastegate outlet. (i) a first position in which the valve diverts all of the exhaust gas from each inlet (12,14) to the first exhaust gas outlet, and prevents gas flow through the at least one wastegate outlet; (ii) a second position in which the valve maintains separate flows of the exhaust gas from each inlet (12,14) to the first and second exhaust gas outlets (16,18), respectively, and prevents gas flow through the at least one wastegate outlet; and (iii) a third position in which the valve maintains the separate flows of the second position, and permits flow of exhaust gas through the at least one wastegate outlet.