Changelog v4.0
-Added V8 Cat 3408 engine sound.
-Improved Cummins 444 and made it working in multi.
Video with the Cat V8:


What's that sound pack adds to the game?
This mod adds those engines and their sounds in the game:

-Detroit Diesel DD13
-Detroit Diesel DD15
-Detroit Diesel 8V92
-Detroit Diesel 60 series
-Cummins 444
-Cummins M11
-Cummins X15
-Cummins Signature 600
-Cummins N14
-Cummins ISX (SCS sound reworked)
-Cummins ISX STRAIGHT PIPED (SCS sounds and from videos)
-Caterpillar V8 3408
-Caterpillar 3406E
-Caterpillar C15 Straight Piped
-Caterpillar C15 STOCK
-Paccar MX series
-Mack MP8
-Volvo D13

Supported trucks :
-Kenworth W900
-Kenworth T680
-Kenworth W990 GTM
-Kenworth T800 GTM
-Kenworth K100
-Kenworth T600
-Mack Anthem
-Mack CHU613
-Freightliner FLB by Harven
-Freightliner Cascadia 2020(SCS)
-Peterbilt 567 GTM
-Peterbilt 389 SCS version and Viper's
-Peterbilt 579
-Peterbilt 387
-International Lonestar
-International LT
-Volvo VNL (SCS)
-Western Star 49X(SCS)

Credits:
kriechbaum