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 contains the following engines, in the Stock and Delete Straight Pipes variants:

Freightliner
-Cascadia

International
-HX520H (Harven)
-Lonestar
-LT

Kenworth
-T680
-T880 (FrankPeru)
-W900
-W990 (Harven/FrankPeru)

Peterbilt
-389
-579

Volvo
-VNL
-VNL 2018

Western Star
-49X
-57X
-5700XE

Updates
v 1.1
-Curvature adjustments in the turbo in Straight Pipes variant.
-Added Volvo VNL 2018 (SCS)

https://www.paypal.com/donate/?hosted_button_id=MB39A8JBM4ZGN

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

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

Download Link 2: Download mod