Descriptions:
This mod contains the X15 series engines produced since 2016, replacing the ISX series to meet EPA specifications.
It contains the following engines, in the Stock and Delete Straight Pipes variants:

Efficiency
-485 HP
-500 HP

Efficiency ADEPT
-485 HP
-500 HP

Performance
-550 HP
-600 HP

Performance ADEPT
-550 HP
-600 HP

Delete Straight Pipes
-485 HP
-500 HP
-550 HP
-600 HP

It has support for the following trucks:
Freightliner
-Cascadia

International
-HX520H (Harven)
-Lonestar
-LT

Kenworth
-T680
-T680 100th Anniversary
-T880 (FrankPeru)
-W900
-W990 (Harven/FrankPeru)

Peterbilt
-389
-579

Volvo
-VNL
-VNL 2018

Western Star
-49X
-57X
-5700XE

Update v 1.3
-Audio correction due to intermittent cuts in turbo sound.
-Added Kenworth T680 100th Anniversary.

Credits:
eelDavidGT, Kapitan Kriechbaum, GTM Team (specifications engines)

Authors:
eelDavidGT, Kapitan Kriechbaum, GTM Team (specifications engines)

Download Link 2: Download mod