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An assembly can include a turbine housing that includes a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat; a bushing configured for receipt by the bore; a rotatable wastegate shaft configured for receipt by the bushing; a wastegate arm extending from the wastegate s

An assembly can include a turbine housing that includes a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat; a bushing configured for receipt by the bore; a rotatable wastegate shaft configured for receipt by the bushing; a wastegate arm extending from the wastegate shaft; and a wastegate plug extending from the wastegate arm where the wastegate plug includes a profile, defined in part by a portion of a torus, for contacting the wastegate seat to cover the wastegate passage and, for example, defined in part by a portion of a modified sphere or a portion of a cone. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

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1. An assembly comprising: a turbine housing that comprises a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat;a bushing configured for receipt by the bore;a rotatable wastegate shaft configured for receipt by the bushing;a wastegate arm extending from the wastegate

1. An assembly comprising: a turbine housing that comprises a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat;a bushing configured for receipt by the bore;a rotatable wastegate shaft configured for receipt by the bushing;a wastegate arm extending from the wastegate shaft; anda wastegate plug extending from the wastegate arm wherein the wastegate plug comprisesa toroidal portion with a profile defined in part by a portion of a torus that defines a wastegate plug axis and that contacts the wastegate seat to cover the wastegate passage in a closed state, andwherein the wastegate plug comprises a modified sphere portion with a profile defined in part by a portion of a modified sphere that defines a clearance with respect to the wastegate seat in an open state,wherein the modified sphere portion comprises, in a plane perpendicular to the wastegate plug axis, a portion of the plug proximal the wastegate shaft on a wastegate shaft side and a portion of the plug opposite the wastegate shaft on a front side and wherein, in the plane perpendicular to the wastegate plug axis, a wastegate shaft side radial dimension of the profile of the modified sphere portion is less than a front side radial dimension of the profile of the modified sphere portion. 2. The assembly of claim 1 wherein the wastegate shaft, the wastegate arm and the wastegate plug comprise a unitary component. 3. The assembly of claim 1 wherein the portion of the modified sphere comprises a cross-section defined at least in part by a portion of an ellipse. 4. The assembly of claim 3 wherein the cross-section is defined at least in part by a portion of a circle. 5. The assembly of claim 4 wherein the cross-section is defined by the portion of the ellipse over a span that includes the wastegate shaft side of the wastegate plug and defined by the portion of the circle over a span that includes the front side of the wastegate plug. 6. The assembly of claim 1 wherein the wastegate seat comprises a profile defined in part by a cone. 7. The assembly of claim 6 wherein the profile of the wastegate plug defined by the portion of the torus contacts the profile of the wastegate seat defined in part by the cone to cover the wastegate passage in the closed state. 8. The assembly of claim 1 wherein the open state comprises an open angle in a range greater than approximately zero degrees to approximately 30 degrees. 9. The assembly of claim 1 wherein the profile of the modified sphere portion is defined in part by a series of planes perpendicular to the wastegate plug axis wherein each of the planes comprises a portion of a circle and a portion of an ellipse. 10. The assembly of claim 1 wherein, in a plane perpendicular to the wastegate plug axis, the front side of the modified sphere portion comprises a profile defined by a portion of a circle. 11. The assembly of claim 1 wherein, in a plane perpendicular to the wastegate plug axis, the shaft side of the modified sphere portion comprises a profile defined by a portion of an ellipse. 12. A wastegate of an exhaust turbine, comprising: a wastegate shaft;an arm that extends from the wastegate shaft; anda plug that extends from the arm wherein the plug comprises a toroidal portion with a profile defined by a portion of a torus that defines a wastegate plug axis of the plug of the exhaust turbine; andwherein the plug further comprises a modified sphere portion with a profile defined by a portion of a modified sphere, wherein the modified sphere portion comprises, in a plane perpendicular to the wastegate plug axis, a portion of the plug proximal the wastegate shaft on a wastegate shaft side and a portion of the plug opposite the wastegate shaft on a front side and wherein, in the plane perpendicular to the wastegate plug axis, a wastegate shaft side radial dimension of the profile of the modified sphere portion is less than a front side radial dimension of the profile of the modified sphere portion. 13. The apparatus of claim 12 wherein the wastegate shaft, the arm and the plug comprise a unitary component. 14. The apparatus of claim 13 wherein the profile of the modified sphere portion is defined in part by a series of planes perpendicular to the wastegate plug axis wherein each of the planes comprises a portion of a circle and a portion of an ellipse. 15. The apparatus of claim 13 wherein, in a plane perpendicular to the wastegate plug axis, the front side of the modified sphere portion comprises a profile defined by a portion of a circle. 16. The apparatus of claim 13 wherein, in a plane perpendicular to the wastegate plug axis, the wastegate shaft side of the modified sphere portion comprises a profile defined by a portion of an ellipse.