I think dyno tuning will be enough. Things like nitro are hardcoded, most likely in main.scm or .exe file. Torque/HP difference doesn't exist in SA, the physics engine is too simple to support different levels of power at various RPM's and many different advanced mechanics.
![[Image: oJ6eTtU.gif]](http://i.imgur.com/oJ6eTtU.gif)