A system includes: a cylinder head for a multi-cylinder internal combustion engine where the cylinder head includes, per cylinder, a first exhaust valve and a corresponding first exhaust port and a second exhaust valve and a corresponding second exhaust port and where, for simultaneous control of the first exhaust valve and the second exhaust valve of a cylinder, for that cylinder, the cylinder head delivers a quantity of exhaust via the first exhaust port and a different quantity of exhaust via the second exhaust port; a first exhaust turbine in fluid communication with the first exhaust ports of the cylinder head; and a second exhaust turbine in fluid communication with the second exhaust ports of the cylinder head. Various other devices, assemblies, controllers, etc., are also disclosed.