motor Mod

This Mod adds some more engines to the ATS.
The engines are available for both trucks (Peterbilt 579 and Kennworth T680)

engine info:
- Paccar MX-13:
    380 hp, 1450 lb ft, 1966 Nm
    405 hp, 1450 lb ft, 1966 Nm
    405 hp, 1550 lb ft, 2102 Nm
    430 hp, 1550 lb ft, 2102 Nm
    430 hp, 1750 lb ft, 2373 Nm
    455 hp, 1750 lb ft, 2373 Nm
    485 hp, 1650 lb ft, 2237 Nm
- Paccar MX-13 chip tuned:
    609 hp, 2581 lb ft, 3500 Nm
- Cummins ISX 15 chip tuned:
    736 hp, 2705 lb ft, 3668 Nm

Engine specs are similar to the real engine's specs.

Have fun!