A turbocharger system comprising: a turbine section with a turbine wheel; a downstream exhaust pipe with a downstream exhaust passage configured to receive exhaust gas from the turbine section; a wastegate with a bypass passage and a valve assembly configured to regulate flow through the bypass passage, the valve assembly including: a poppet comprising a plurality of pockets (220, 222), the pockets (220, 222) each comprising a respective radial opening, the poppet being configured to move between a closed position and an open position, wherein the poppet is configured to substantially close the bypass passage when in the closed position, and wherein the poppet is configured to open the bypass passage when in the open position and allow exhaust gas to flow to the downstream exhaust passage, the poppet having an axis; an arm that is attached to the poppet and that supports movement of the poppet between the closed position and the open position; and a plurality of biasing members that are disposed within respective ones of the plurality of pockets (220, 222), the plurality of biasing members abutting against and frictionally engaging an interior surface of the respective pocket (220, 222) and being partly exposed through the respective radial opening to abut against and frictionally engage the arm, the plurality of biasing members providing a biasing force directed in a radial direction relative to the axis, the plurality of biasing members being disposed substantially symmetrically with respect to a first radial line of symmetry and a second radial line of symmetry. a turbine section with a turbine wheel; a downstream exhaust pipe with a downstream exhaust passage configured to receive exhaust gas from the turbine section; a wastegate with a bypass passage and a valve assembly configured to regulate flow through the bypass passage, the valve assembly including: a poppet comprising a plurality of pockets (220, 222), the pockets (220, 222) each comprising a respective radial opening, the poppet being configured to move between a closed position and an open position, wherein the poppet is configured to substantially close the bypass passage when in the closed position, and wherein the poppet is configured to open the bypass passage when in the open position and allow exhaust gas to flow to the downstream exhaust passage, the poppet having an axis; an arm that is attached to the poppet and that supports movement of the poppet between the closed position and the open position; and a plurality of biasing members that are disposed within respective ones of the plurality of pockets (220, 222), the plurality of biasing members abutting against and frictionally engaging an interior surface of the respective pocket (220, 222) and being partly exposed through the respective radial opening to abut against and frictionally engage the arm, the plurality of biasing members providing a biasing force directed in a radial direction relative to the axis, the plurality of biasing members being disposed substantially symmetrically with respect to a first radial line of symmetry and a second radial line of symmetry. a poppet comprising a plurality of pockets (220, 222), the pockets (220, 222) each comprising a respective radial opening, the poppet being configured to move between a closed position and an open position, wherein the poppet is configured to substantially close the bypass passage when in the closed position, and wherein the poppet is configured to open the bypass passage when in the open position and allow exhaust gas to flow to the downstream exhaust passage, the poppet having an axis; an arm that is attached to the poppet and that supports movement of the poppet between the closed position and the open position; and a plurality of biasing members that are disposed within respective ones of the plurality of pockets (220, 222), the plurality of biasing members abutting against and frictionally engaging an interior surface of the respective pocket (220, 222) and being partly exposed through the respective radial opening to abut against and frictionally engage the arm, the plurality of biasing members providing a biasing force directed in a radial direction relative to the axis, the plurality of biasing members being disposed substantially symmetrically with respect to a first radial line of symmetry and a second radial line of symmetry.