CAT C15 6NZ Stock Sound for American Truck Simulator
The Caterpillar C15 6NZ from 435 to 625 hp with its stock, muffled sound for SCS and modded trucks. Free, by Slav Jerry; updated in March 2026.
Download CAT C15 6NZ Stock Sound
More screenshots on Steam Workshop ↗
What this mod does
CAT C15 6NZ Stock Sound is the «stock» version of the Caterpillar C15 6NZ sound by Slav Jerry. If his straight-pipe CAT C15 6NZ sounds too loud to you, this is the same engine with factory mufflers, closer to what you hear on a working truck.
What’s included
- C15 6NZ engines from 435 to 625 hp with stock mufflers.
- Also replaces the C15 on the SCS Peterbilt 389 and Kenworth W900.
- Engine fan that kicks in on its own.
- Exhaust stack effects, distance attenuation and directional sound based on your position.
Compatibility
It works on some SCS trucks and on many modded ones; in the comments the author confirms it works on DOM’s and Jon Ruda’s trucks. He also says it can be used as an optional mod on Convoy, although one user says they couldn’t join a server with it.
Version and credits
This is version 1.0: released on October 31, 2025 and updated on March 31, 2026, around ATS 1.58. The author doesn’t list a game version. Credits: Slav Jerry (sound) and Louisiana Truckspotting (exhaust samples). The same author also made the Cummins ISX stock sound.
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User rating
Highlights and things to keep in mind
- Stock sound that's less tiring on long hauls
- Exhaust samples from a real truck
- Works on many modded trucks
- No game version listed
- Doesn't work on every SCS truck
- One user reports trouble joining Convoy
Requirements
- American Truck Simulator (no version listed; updated in March 2026, around 1.58)
- Steam account
- No DLC required
- An SCS or modded truck that supports the CAT C15
How to install it
- Open the "CAT C15 6NZ Stock sound" page on Steam Workshop and click "Subscribe".
- Launch American Truck Simulator and wait for Steam to finish downloading the mod.
- In your profile's Mod Manager, enable "CAT C15 6NZ Stock sound".
- Go to a service shop and fit a CAT C15 6NZ engine (on the SCS Peterbilt 389 and W900 it replaces the stock C15).
Version history
-
1.031 Mar 2026Current
Latest update (2 change notes; contents not reviewed)
-
1.031 Oct 2025
Release
Common problems
How is it different from the straight-pipe version?
This one uses stock mufflers; the author's other mod removes the muffler.
Does it work with Jon Ruda's and DOM's trucks?
Yes, according to the author in the comments.
Can I use it on Convoy?
The author says yes, as an optional mod, although one user had trouble joining a server.
Is there an earlier version?
No; the author clarifies this is 1.0.
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