Wreckfest

Description

So, here's something less straightforward: God mode.
This script will ensure your car won't break even if it's already flat 
A very excessive sudden damage could still, in theory, kill you but I did not have any such problems for hours.

Adopting this script should be very easy to set all other cars' health to 1 (instead of the max) for a quick destruction of all other cars, but once again, I did not bother.

I am not planning any support for this script as the game did not live up to my expectations.

Update #1
Added that low enemy health bit.
A damage through a car's armour is still required (e.g. crashing into them).
That default 1.0 will cause soft targets to die off with ease, but it might take a bigger hit or several smaller ones to get through the armour of stronger cars.
Setting it to 0 will cause them to wreck instantly on the first bump that gets through the armour, no matter how small - this is perfect for the oval track with all the school buses (survival).

Update #2
Added Torque mod.
Once enabled, you can hold the hotkey while driving to change your torque on the fly.
While it is not an equivalent to Flatout's nitro capability (as this one changes only your torque), you will notice a notable change in your acceleration.
The default value is 2 - it doubles your torque by default. Seems to much to me, but I'll let you figure out what's best for you.
The hotkey is CTRL by default - but you can change that scan code on the top of the script.