This mod adds sounds and engines. -Detroit Diesel 60 Series -Cummins ISX -Cummins 444 -Cummins N14 -Cummins N14 2.0 (another sound in the cabin) -Cummins N14 Celect PLUS -Caterpillar C15 -Caterpillar C15 straight-through exhaust -Caterpillar 3406E -Paccar MX series For the following trucks Kenworth w900 Peterbilt 579 Kenworth T680 Peterbilt 389 International Lonstar Kenworth T800 GTM Changes Added support International Lonstar