Replace the police, police2 and police3, sheriff and fbi handling entries of the handling.meta located in 
mods\update\update.rpf\common\data with the new ones:

    <Item type="CHandlingData">
      <handlingName>POLICE</handlingName>
    <fMass value="1600.000000"/>
    <fInitialDragCoeff value="6.000000"/>
    <fDownforceModifier value="1.075000"/>
    <fPercentSubmerged value="85.000000"/>
    <vecCentreOfMassOffset x="0.000000" y="0.160000" z="-0.120000"/>
    <vecInertiaMultiplier x="1.200000" y="1.600000" z="1.900000"/>
    <fDriveBiasFront value="0.000000"/>
    <nInitialDriveGears value="5"/>
    <fInitialDriveForce value="0.200000"/>
    <fDriveInertia value="1.000000"/>
    <fClutchChangeRateScaleUpShift value="1.500000"/>
    <fClutchChangeRateScaleDownShift value="2.000000"/>
    <fInitialDriveMaxFlatVel value="140.000000"/>
    <fBrakeForce value="0.420000"/>
    <fBrakeBiasFront value="0.525000"/>
    <fHandBrakeForce value="0.500000"/>
    <fSteeringLock value="40.000000"/>
    <fTractionCurveMax value="1.750000"/>
    <fTractionCurveMin value="1.595000"/>
    <fTractionCurveLateral value="22.000000"/>
    <fTractionSpringDeltaMax value="0.100000"/>
    <fLowSpeedTractionLossMult value="0.150000"/>
    <fCamberStiffnesss value="0.000000"/>
    <fTractionBiasFront value="0.487500"/>
    <fTractionLossMult value="1.000000"/>
    <fSuspensionForce value="2.500000"/>
    <fSuspensionCompDamp value="1.000000"/>
    <fSuspensionReboundDamp value="1.000000"/>
    <fSuspensionUpperLimit value="0.105000"/>
    <fSuspensionLowerLimit value="-0.110000"/>
    <fSuspensionRaise value="0.000000"/>
    <fSuspensionBiasFront value="0.500000"/>
    <fAntiRollBarForce value="0.000000"/>
    <fAntiRollBarBiasFront value="0.500000"/>
    <fRollCentreHeightFront value="0.220000"/>
    <fRollCentreHeightRear value="0.220000"/>
    <fCollisionDamageMult value="0.700000"/>
    <fWeaponDamageMult value="1.000000"/>
    <fDeformationDamageMult value="0.800000"/>
    <fEngineDamageMult value="1.500000"/>
    <fPetrolTankVolume value="65.000000"/>
    <fOilVolume value="5.000000"/>
    <fSeatOffsetDistX value="0.000000"/>
    <fSeatOffsetDistY value="0.000000"/>
    <fSeatOffsetDistZ value="0.000000"/>
    <nMonetaryValue value="35000"/>
    <fRocketBoostCapacity value="1.250000"/>
    <fBoostMaxSpeed value="70.000000"/>
    <strModelFlags>00440010</strModelFlags>
    <strHandlingFlags>00820100</strHandlingFlags>
    <strDamageFlags>00000000</strDamageFlags>
    <AIHandling>SPORTS_CAR</AIHandling>
    <SubHandlingData>
        <Item type="NULL"/>
        <Item type="NULL"/>
        <Item type="NULL"/>
    </SubHandlingData>
</Item>
		<Item type="CHandlingData">
      <handlingName>police2</handlingName>
      <fMass value="1650.000000" />
      <fInitialDragCoeff value="4.7500" />
      <fDownforceModifier value="1.0100000" />
      <fPercentSubmerged value="85.000000" />
      <vecCentreOfMassOffset x="0.000000" y="0.000000" z="0.100000" />
      <vecInertiaMultiplier x="1.000000" y="1.400000" z="1.700000" />
      <fDriveBiasFront value="0.000000" />
      <nInitialDriveGears value="5" />
      <fInitialDriveForce value="0.2500000" />
      <fDriveInertia value="1.000" />
      <fClutchChangeRateScaleUpShift value="2.000000" />
      <fClutchChangeRateScaleDownShift value="2.000000" />
      <fInitialDriveMaxFlatVel value="146.000000" />
      <fBrakeForce value="0.450000" />
      <fBrakeBiasFront value="0.600" />
      <fHandBrakeForce value="0.600000" />
      <fSteeringLock value="40.000000" />
      <fTractionCurveMax value="1.7000" />
      <fTractionCurveMin value="1.600" />
      <fTractionCurveLateral value="22.00000" />
      <fTractionSpringDeltaMax value="0.10000" />
      <fLowSpeedTractionLossMult value="0.250000" />
      <fCamberStiffnesss value="0.000000" />
      <fTractionBiasFront value="0.495000" />
      <fTractionLossMult value="0.500000" />
      <fSuspensionForce value="2.7500000" />
      <fSuspensionCompDamp value="1.250000" />
      <fSuspensionReboundDamp value="1.25000" />
      <fSuspensionUpperLimit value="0.08000" />
      <fSuspensionLowerLimit value="-0.125000" />
      <fSuspensionRaise value="0.0000000" />
      <fSuspensionBiasFront value="0.50000" />
      <fAntiRollBarForce value="0.250000" />
      <fAntiRollBarBiasFront value="0.50000" />
      <fRollCentreHeightFront value="0.4250000" />
      <fRollCentreHeightRear value="0.42500" />
      <fCollisionDamageMult value="1.000000" />
      <fWeaponDamageMult value="1.000000" />
      <fDeformationDamageMult value="0.800000" />
      <fEngineDamageMult value="1.500000" />
      <fPetrolTankVolume value="65.000000" />
      <fOilVolume value="5.000000" />
      <fSeatOffsetDistX value="0.000000" />
      <fSeatOffsetDistY value="0.000000" />
      <fSeatOffsetDistZ value="0.000000" />
      <nMonetaryValue value="25000" />
      <strModelFlags>440010</strModelFlags>
      <strHandlingFlags>820100</strHandlingFlags>
      <strDamageFlags>0</strDamageFlags>
      <AIHandling>SPORTS_CAR</AIHandling>
      <SubHandlingData>
        <Item type="NULL" />
        <Item type="NULL" />
      </SubHandlingData>
    </Item>
    <Item type="CHandlingData">
    <handlingName>police3</handlingName>
    <fMass value="1500.000000"/>
    <fInitialDragCoeff value="6.000000"/>
    <fPercentSubmerged value="85.000000"/>
    <vecCentreOfMassOffset x="0.000000" y="0.020000" z="-0.090000"/>
    <vecInertiaMultiplier x="1.300000" y="1.600000" z="2.000000"/>
    <fDriveBiasFront value="0.000000"/>
    <nInitialDriveGears value="5"/>
    <fInitialDriveForce value="0.220000"/>
    <fDriveInertia value="1.250000"/>
    <fClutchChangeRateScaleUpShift value="2.300000"/>
    <fClutchChangeRateScaleDownShift value="2.300000"/>
    <fInitialDriveMaxFlatVel value="139.000046"/>
    <fBrakeForce value="0.600000"/>
    <fBrakeBiasFront value="0.600000"/>
    <fHandBrakeForce value="0.750000"/>
    <fSteeringLock value="40.000000"/>
    <fTractionCurveMax value="1.950000"/>
    <fTractionCurveMin value="1.750000"/>
    <fTractionCurveLateral value="21.799984"/>
    <fTractionSpringDeltaMax value="0.150000"/>
    <fLowSpeedTractionLossMult value="0.100000"/>
    <fCamberStiffnesss value="0.000000"/>
    <fTractionBiasFront value="0.500000"/>
    <fTractionLossMult value="1.000000"/>
    <fSuspensionForce value="2.650000"/>
    <fSuspensionCompDamp value="1.200000"/>
    <fSuspensionReboundDamp value="1.200000"/>
    <fSuspensionUpperLimit value="0.110000"/>
    <fSuspensionLowerLimit value="-0.115000"/>
    <fSuspensionRaise value="0.000000"/>
    <fSuspensionBiasFront value="0.500000"/>
    <fAntiRollBarForce value="0.300000"/>
    <fAntiRollBarBiasFront value="0.500000"/>
    <fRollCentreHeightFront value="0.350000"/>
    <fRollCentreHeightRear value="0.350000"/>
    <fCollisionDamageMult value="0.700000"/>
    <fWeaponDamageMult value="1.000000"/>
    <fDeformationDamageMult value="0.800000"/>
    <fEngineDamageMult value="1.500000"/>
    <fPetrolTankVolume value="65.000000"/>
    <fOilVolume value="5.000000"/>
    <fSeatOffsetDistX value="0.000000"/>
    <fSeatOffsetDistY value="0.000000"/>
    <fSeatOffsetDistZ value="0.000000"/>
    <nMonetaryValue value="35000"/>
    <fRocketBoostCapacity value="1.250000"/>
    <fBoostMaxSpeed value="70.000000"/>
    <strModelFlags>00440010</strModelFlags>
    <strHandlingFlags>00820100</strHandlingFlags>
    <strDamageFlags>00000000</strDamageFlags>
    <AIHandling>SPORTS_CAR</AIHandling>
    <SubHandlingData>
        <Item type="NULL"/>
        <Item type="NULL"/>
        <Item type="NULL"/>
    </SubHandlingData>
</Item>

    <Item type="CHandlingData">
      <handlingName>sheriff</handlingName>
    <fMass value="1600.000000"/>
    <fInitialDragCoeff value="6.000000"/>
    <fDownforceModifier value="1.075000"/>
    <fPercentSubmerged value="85.000000"/>
    <vecCentreOfMassOffset x="0.000000" y="0.160000" z="-0.120000"/>
    <vecInertiaMultiplier x="1.200000" y="1.600000" z="1.900000"/>
    <fDriveBiasFront value="0.000000"/>
    <nInitialDriveGears value="5"/>
    <fInitialDriveForce value="0.200000"/>
    <fDriveInertia value="1.000000"/>
    <fClutchChangeRateScaleUpShift value="1.500000"/>
    <fClutchChangeRateScaleDownShift value="2.000000"/>
    <fInitialDriveMaxFlatVel value="140.000000"/>
    <fBrakeForce value="0.420000"/>
    <fBrakeBiasFront value="0.525000"/>
    <fHandBrakeForce value="0.500000"/>
    <fSteeringLock value="40.000000"/>
    <fTractionCurveMax value="1.750000"/>
    <fTractionCurveMin value="1.595000"/>
    <fTractionCurveLateral value="22.000000"/>
    <fTractionSpringDeltaMax value="0.100000"/>
    <fLowSpeedTractionLossMult value="0.150000"/>
    <fCamberStiffnesss value="0.000000"/>
    <fTractionBiasFront value="0.487500"/>
    <fTractionLossMult value="1.000000"/>
    <fSuspensionForce value="2.500000"/>
    <fSuspensionCompDamp value="1.000000"/>
    <fSuspensionReboundDamp value="1.000000"/>
    <fSuspensionUpperLimit value="0.105000"/>
    <fSuspensionLowerLimit value="-0.110000"/>
    <fSuspensionRaise value="0.000000"/>
    <fSuspensionBiasFront value="0.500000"/>
    <fAntiRollBarForce value="0.000000"/>
    <fAntiRollBarBiasFront value="0.500000"/>
    <fRollCentreHeightFront value="0.220000"/>
    <fRollCentreHeightRear value="0.220000"/>
    <fCollisionDamageMult value="0.700000"/>
    <fWeaponDamageMult value="1.000000"/>
    <fDeformationDamageMult value="0.800000"/>
    <fEngineDamageMult value="1.500000"/>
    <fPetrolTankVolume value="65.000000"/>
    <fOilVolume value="5.000000"/>
    <fSeatOffsetDistX value="0.000000"/>
    <fSeatOffsetDistY value="0.000000"/>
    <fSeatOffsetDistZ value="0.000000"/>
    <nMonetaryValue value="35000"/>
    <fRocketBoostCapacity value="1.250000"/>
    <fBoostMaxSpeed value="70.000000"/>
    <strModelFlags>00440010</strModelFlags>
    <strHandlingFlags>00820100</strHandlingFlags>
    <strDamageFlags>00000000</strDamageFlags>
    <AIHandling>SPORTS_CAR</AIHandling>
    <SubHandlingData>
        <Item type="NULL"/>
        <Item type="NULL"/>
        <Item type="NULL"/>
    </SubHandlingData>
</Item>

		<Item type="CHandlingData">
      <handlingName>fbi</handlingName>
      <fMass value="1650.000000" />
      <fInitialDragCoeff value="4.7500" />
      <fDownforceModifier value="1.0100000" />
      <fPercentSubmerged value="85.000000" />
      <vecCentreOfMassOffset x="0.000000" y="0.000000" z="0.100000" />
      <vecInertiaMultiplier x="1.000000" y="1.400000" z="1.700000" />
      <fDriveBiasFront value="0.000000" />
      <nInitialDriveGears value="5" />
      <fInitialDriveForce value="0.2500000" />
      <fDriveInertia value="1.000" />
      <fClutchChangeRateScaleUpShift value="2.000000" />
      <fClutchChangeRateScaleDownShift value="2.000000" />
      <fInitialDriveMaxFlatVel value="146.000000" />
      <fBrakeForce value="0.450000" />
      <fBrakeBiasFront value="0.600" />
      <fHandBrakeForce value="0.600000" />
      <fSteeringLock value="40.000000" />
      <fTractionCurveMax value="1.7000" />
      <fTractionCurveMin value="1.600" />
      <fTractionCurveLateral value="22.00000" />
      <fTractionSpringDeltaMax value="0.10000" />
      <fLowSpeedTractionLossMult value="0.250000" />
      <fCamberStiffnesss value="0.000000" />
      <fTractionBiasFront value="0.495000" />
      <fTractionLossMult value="0.500000" />
      <fSuspensionForce value="2.7500000" />
      <fSuspensionCompDamp value="1.250000" />
      <fSuspensionReboundDamp value="1.25000" />
      <fSuspensionUpperLimit value="0.08000" />
      <fSuspensionLowerLimit value="-0.125000" />
      <fSuspensionRaise value="0.0000000" />
      <fSuspensionBiasFront value="0.50000" />
      <fAntiRollBarForce value="0.250000" />
      <fAntiRollBarBiasFront value="0.50000" />
      <fRollCentreHeightFront value="0.4250000" />
      <fRollCentreHeightRear value="0.42500" />
      <fCollisionDamageMult value="1.000000" />
      <fWeaponDamageMult value="1.000000" />
      <fDeformationDamageMult value="0.800000" />
      <fEngineDamageMult value="1.500000" />
      <fPetrolTankVolume value="65.000000" />
      <fOilVolume value="5.000000" />
      <fSeatOffsetDistX value="0.000000" />
      <fSeatOffsetDistY value="0.000000" />
      <fSeatOffsetDistZ value="0.000000" />
      <nMonetaryValue value="25000" />
      <strModelFlags>440010</strModelFlags>
      <strHandlingFlags>820100</strHandlingFlags>
      <strDamageFlags>0</strDamageFlags>
      <AIHandling>SPORTS_CAR</AIHandling>
      <SubHandlingData>
        <Item type="NULL" />
        <Item type="NULL" />
      </SubHandlingData>
    </Item>