ATS - Cat C-15 (6NZ) Sound for Oldies (1.38.x)

Hi guys this mod add new caterpillar c-15(6nz) sound,engines
for trucks using this serie engines.

Engines:
cat c-15 tt 450
cat c-15 tt 500
cat c-15 tt 550
cat c-15 tt 600
cat c-15 tt 720

All engines have own specific norms(price,fuel cons,torque curves,engine brake power..)

Contained trucks:
freightliner argosy harven
freightliner flb harven
freightliner classic xl bsa
kenworth k100 overfloeter
kenworth.t800 gtm
kenworth t680 scs
kenworth.w900 scs
kenworth.w900b gtm
peterbilt 387 r.modjeski
peterbilt 386 r.modjeski
peterbilt.389 scs
peterbilt.579 scs

Authors: Voith