To modify vehicle performance physics in GTA V / FiveM:

1. From CPed, read current vehicle pointer (CPed + 0xD30).
2. From CVehicle, read CHandlingData at offset 0x938.
3. In CHandlingData:
   • fMass (float at offset 0x0C)
   • fInitialDriveForce (float at offset 0x4C): Engine power multiplier.
   • fDriveBiasFront (float at offset 0x48): AWD bias (0.0 = RWD, 0.5 = AWD, 1.0 = FWD).
   • fTractionCurveMax (float at offset 0x88): Cornering grip.
   • fBrakeForce (float at offset 0x6C): Instant braking.

Writing fInitialDriveForce = 2.5f turns any standard car into a 300mph supercar.

Setting fTractionCurveMax to 3.0 allows taking sharp 90-degree turns at top speed without sliding.

Handling struct offsets are rock solid in GTA 1.6x base.