Cummins ISX Engines & Sounds Pack
This mod contains the following Cummins ISX engines according to the following horsepower:
ISX12 370
ISX12 425
ISX15 450
ISX15 500
ISX15 550
ISX15 600

In addition, it contains two engines from Cummins ISX Signature line, dedicated especially for oversized and overweight loads:

ISX Signature 600
ISX Signature 720 Chipped

Contains the following variants:
-Stock Version
-Open Pipes
-Straight Pipes

One sound variant are based on Kapitan Kriechbaum's audios and another two from Odd_Fellow, adapted according to use of mods prior to 1.36 ATS.

The sounds of the Cummins ISX Signature are based on the sounds of Kapitan Kriechbaum for the 2015 versions of Euro Truck Simulator 2, and they are present in all the trucks on the list.

Tested on American Truck Simulator versions 1.44 to 1.53 per FMOD guidelines, includes engine sounds in the game's convoy mode.
Updates:
v 2.3.2
- Correction of turbo exhaust sounds in the Open Pipes and Straight Pipes variants.
- Engine sound of the ISX Signature (from the optional mod) was corrected.

v 2.3.1
-Correction of engine brake audio according to game audio system requirements. Note: the audio of the turbochargers becomes unrealistic due to FMod system requirements.

v 2.3
-Added:
*Volvo VNL 2018 (SCS)
*Mack Pinnacle (SCS)
*Freightliner Cascadia 2024 (SCS)
*Kenworth T800 (Yanred/FrankPerú)
*Western Star 4900EX (Outlaw)
-Exhaust distancing adjustment of the Open Pipes and Straight Pipes variants.
-New engine brake audio track for the Straight Pipes variant (credits to Slav Jerry).

v 2.2
-Added Kenworth T680 100th Anniversary (SCS).

v 2.1
-Volume adjustment on all engine sounds.
-Audio correction due to intermittent cuts in turbo sound.

v 2.0
-Added support for Western Star 5700XE (SCS)
-Minor corrections in sounds.

v 1.9
-Change of icon in the purchase options in the workshop (to avoid author confusion).
-Addition and/or trimming of some sound samples for the Cummins ISX Signature.
-Slight improvements in exhaust sound positioning only on Straight Pipes and Open Pipes variants.
-Added ISX Open Pipes engine idle exhaust track.
-Removed sound variant (not option) from Volvo variant ISX, will be added in another engines mod, and replaced by Kenworth variant.
-Rename of the sound banks (if you have the previous version of the mod, it is recommended to change the engine in the workshop and replace it with the new version in your Manager).

v 1.8
-Volume regularization of the sounds of the stock variants.
-Added Western Star 57X (SCS).
-Correction of volume of the sounds in convoy in all the variants.

v 1.7
-New engine brake tracks for the Open Pipes variant.
-General volume settings for all tracks.

v 1.6
-Added International 9900i (SCS).

v 1.5
-To the Open Pipes variant the engine brake was changed, also added turbocharger effect on the jake brake.
-Made idles exhaust & engine volume adjustment on the Straight Pipes variant.
-Performed turbo camber adjustment on all variants.
-Added Open Pipes and Straight Pipes variants on all trucks supported by the mod (See the "Truck Support Listing" file).

v 1.4
-One of the sound variants becomes open pipes (check with the "Truck Support Listing" file to see which trucks come in that version).
-Track setting for the engine brake on the now open pipes variant.
-Other minor adjustments to some tracks in all variants.

v 1.3
-Compatibility with version 1.43; The equalization of the sounds in the cabin is improved, according to the requirements of SCS Software.

v 1.2
-Engine loading and unloading sounds adjustments on Volvo variant.
-Support engines in traffic in convoy mode (multiplayer).

v 1.1
-The ventilator effect on the Volvo sound variant is eliminated.

-Adjusts the volume of the BOV effect in the Straight Escapes variant.

-Added Straight Exhaust variant the following trucks:
--Kenworth T800 (FranckPerú)
--Kenworth T600 (FranckPerú)
--Kenworth K100e (OverFloater)
--Freightliner Classic XL (BSA)
--Kenworth W900 (SCS)
--Peterbilt 389 (SCS)
--Peterbilt 389 (Viper2)

Credits: 
eelDavidGT (conversion of audios to FMOD system and mixing of various sounds)
Mocos Trucker, Juan_DF, Mapache Game (tests)
Kapitan Kriechbaum, Odd_Fellow (original sounds)
SCS (base sounds)