This is the ruleset I use when playing with the Bolide components. Including:
* Speedier play with simultaneous movement.
* Intuitive 'tyre strain point' system for panic braking/speed turning. Three tyre types with different specs.
* Diagonal moves = 1.5 steps. Slightly adjusted rules for legal car movement.
* Changed rules for boost/slipstream, to work more generally.
* Die rolls almost eliminated.

The file is written as a complete rulebook - you do not have to have the Bolide rulebook.

For me personally, I find this improves the game a lot. If anything is unclear, feel free to geekmail me.