Internal damage is defined as: ANY damage that bypasses or breaches the armor of the car, inflicting injury or damage to the occupants of the car, cargo, engine or any operational weapons.
- Some weapons CAN bypass armor if the gunner is skilled enough.
- Some weapons damage engines better than others.
- Some weapons damage armor better than others.
- Some weapons will take out armor AND internals! (ok when armor is breached, most weapons will take the head off your opponent!)
Your best bet would be to try different cars with different weapons to find the best killing machine for your play style.