Audi e-tron (+ add-on files)for GTA V by "elcreador" 
This mod replace infernus.
Conversion from Assetto corsa.
It is recommended that you use OpenIV's mod manager feature (http://openiv.com/?p=1132) with rpf mods to provide easy switching of rpf mods to off for online play to avoid bans. 

Files: 
-Replace folder
-Add-on folder 

Enjoy.

With OPENIV in edit mode you can replace the files: 
-------------------------------------------------------------------------------------------------- REPLACE METOD:

- infernus install

1-Replace infernus files; you can find them in: 
GTA V\update\x64\dlcpacks\patchday2ng\dlc.rpf\x64\levels\gta5\vehicles.rpf\


----------------------------------------------------------------------------------------------

2-Replace handling.meta in: 
GTA V\update\update.rpf\common\data
Or
You can either replace only the vehicles lines editing the files:

Extract it with OpenIV and edit it with Notepad++. Open the file, press CTRL+F and search for "infernus" until you find the part where infernus is listed.

Overwrite original entry with the following:


<handlingName>INFERNUS</handlingName>
      <fMass value="1500.000000" />
      <fInitialDragCoeff value="6.000000" />
      <fPercentSubmerged value="85.000000" />
      <vecCentreOfMassOffset x="0.000000" y="0.050000" z="0.000000" />
      <vecInertiaMultiplier x="1.000000" y="1.600000" z="1.900000" />
      <fDriveBiasFront value="0.000000" />
      <nInitialDriveGears value="6" />
      <fInitialDriveForce value="0.454000" />
      <fDriveInertia value="1.000000" />
      <fClutchChangeRateScaleUpShift value="4.000000" />
      <fClutchChangeRateScaleDownShift value="6.000000" />
      <fInitialDriveMaxFlatVel value="170.000000" />
      <fBrakeForce value="1.000000" />
      <fBrakeBiasFront value="0.450000" />
      <fHandBrakeForce value="1.000000" />
      <fSteeringLock value="55.000000" />
      <fTractionCurveMax value="3.950000" />
      <fTractionCurveMin value="3.950000" />
      <fTractionCurveLateral value="35.500000" />
      <fTractionSpringDeltaMax value="0.390000" />
      <fLowSpeedTractionLossMult value="3.700000" />
      <fCamberStiffnesss value="0.000000" />
      <fTractionBiasFront value="0.485000" />
      <fTractionLossMult value="1.000000" />
      <fSuspensionForce value="2.650000" />
      <fSuspensionCompDamp value="1.500000" />
      <fSuspensionReboundDamp value="2.200000" />
      <fSuspensionUpperLimit value="0.050000" />
      <fSuspensionLowerLimit value="-0.090000" />
      <fSuspensionRaise value="0.000000" />
      <fSuspensionBiasFront value="0.520000" />
      <fAntiRollBarForce value="1.000000" />
      <fAntiRollBarBiasFront value="0.500000" />
      <fRollCentreHeightFront value="0.340000" />
      <fRollCentreHeightRear value="0.340000" />
      <fCollisionDamageMult value="0.700000" />
      <fWeaponDamageMult value="1.000000" />
      <fDeformationDamageMult value="0.700000" />
      <fEngineDamageMult value="1.500000" />
      <fPetrolTankVolume value="65.000000" />
      <fOilVolume value="5.000000" />
      <fSeatOffsetDistX value="0.000000" />
      <fSeatOffsetDistY value="-0.100000" />
      <fSeatOffsetDistZ value="0.050000" />
      <nMonetaryValue value="35000" />
      <strModelFlags>440010</strModelFlags>
      <strHandlingFlags>0</strHandlingFlags>
      <strDamageFlags>0</strDamageFlags>
      <AIHandling>AVERAGE</AIHandling>
      <SubHandlingData>
        <Item type="NULL" />
        <Item type="NULL" />
        <Item type="NULL" />
      </SubHandlingData>